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69430021 = 80098669
BaseRepresentation
bin1000010001101…
…10101100000101
311211122102002021
410020312230011
5120233230041
610520043141
71502100613
oct410665405
9154572067
1069430021
1136211891
121b3034b1
13114cc26b
1493146b3
156166cd1
hex4236b05

69430021 has 4 divisors (see below), whose sum is σ = 69446700. Its totient is φ = 69413344.

The previous prime is 69430003. The next prime is 69430027. The reversal of 69430021 is 12003496.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 37957921 + 31472100 = 6161^2 + 5610^2 .

It is a cyclic number.

It is not a de Polignac number, because 69430021 - 211 = 69427973 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 (69430027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3675 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (17361675).

Almost surely, 269430021 is an apocalyptic number.

It is an amenable number.

69430021 is a deficient number, since it is larger than the sum of its proper divisors (16679).

69430021 is an equidigital number, since it uses as much as digits as its factorization.

69430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16678.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 69430021 is about 8332.4678817263. The cubic root of 69430021 is about 411.0068867331.

The spelling of 69430021 in words is "sixty-nine million, four hundred thirty thousand, twenty-one".

Divisors: 1 8009 8669 69430021