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1999131463 = 7285590209
BaseRepresentation
bin111011100101000…
…0101001101000111
312011022201101211001
41313022011031013
513043234201323
6530212154131
7100353223420
oct16712051507
95138641731
101999131463
1193650406a
12479608947
1325b231c34
1414d710647
15ba7903ad
hex77285347

1999131463 has 4 divisors (see below), whose sum is σ = 2284721680. Its totient is φ = 1713541248.

The previous prime is 1999131427. The next prime is 1999131469. The reversal of 1999131463 is 3641319991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3641319991 = 29711225621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1999131463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999131469) 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, 142795098 + ... + 142795111.

It is an arithmetic number, because the mean of its divisors is an integer number (571180420).

Almost surely, 21999131463 is an apocalyptic number.

1999131463 is a deficient number, since it is larger than the sum of its proper divisors (285590217).

1999131463 is an equidigital number, since it uses as much as digits as its factorization.

1999131463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285590216.

The product of its digits is 157464, while the sum is 46.

The square root of 1999131463 is about 44711.6479566567. The cubic root of 1999131463 is about 1259.7386421462.

The spelling of 1999131463 in words is "one billion, nine hundred ninety-nine million, one hundred thirty-one thousand, four hundred sixty-three".

Divisors: 1 7 285590209 1999131463