690544431 has 12 divisors (see below), whose sum is σ = 1024411752. Its totient is φ = 447920496.

The previous prime is 690544409. The next prime is 690544441. The reversal of 690544431 is 134445096.

It is not a de Polignac number, because 690544431 - 2²⁷ = 556326703 is a prime.

It is a super-2 number, since 2×690544431² = 953703222370227522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690544441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1036521 + ... + 1037186.

It is an arithmetic number, because the mean of its divisors is an integer number (85367646).

Almost surely, 2^690544431 is an apocalyptic number.

690544431 is a deficient number, since it is larger than the sum of its proper divisors (333867321).

690544431 is a wasteful number, since it uses less digits than its factorization.

690544431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073750 (or 2073747 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 690544431 is about 26278.2120967162. The cubic root of 690544431 is about 883.8879415262.

The spelling of 690544431 in words is "six hundred ninety million, five hundred forty-four thousand, four hundred thirty-one".