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1995503421 = 3665167807
BaseRepresentation
bin111011011110000…
…1111011100111101
312011001220002002010
41312330033130331
513041322102141
6530002321433
7100310333142
oct16674173475
95131802063
101995503421
1193445628a
12478359279
1325a561772
1414d0483c9
15ba2c5416
hex76f0f73d

1995503421 has 4 divisors (see below), whose sum is σ = 2660671232. Its totient is φ = 1330335612.

The previous prime is 1995503383. The next prime is 1995503459. The reversal of 1995503421 is 1243055991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1995503383) and next prime (1995503459).

It is not a de Polignac number, because 1995503421 - 211 = 1995501373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1995503421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995573421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332583901 + ... + 332583906.

It is an arithmetic number, because the mean of its divisors is an integer number (665167808).

Almost surely, 21995503421 is an apocalyptic number.

It is an amenable number.

1995503421 is a deficient number, since it is larger than the sum of its proper divisors (665167811).

1995503421 is an equidigital number, since it uses as much as digits as its factorization.

1995503421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665167810.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 1995503421 is about 44671.0579794121. The cubic root of 1995503421 is about 1258.9761189588.

The spelling of 1995503421 in words is "one billion, nine hundred ninety-five million, five hundred three thousand, four hundred twenty-one".

Divisors: 1 3 665167807 1995503421