690989597 has 4 divisors (see below), whose sum is σ = 713279616. Its totient is φ = 668699580.

The previous prime is 690989573. The next prime is 690989609. The reversal of 690989597 is 795989096.

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 a cyclic number.

It is not a de Polignac number, because 690989597 - 2¹² = 690985501 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 (690989197) 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, 11144963 + ... + 11145024.

It is an arithmetic number, because the mean of its divisors is an integer number (178319904).

Almost surely, 2^690989597 is an apocalyptic number.

It is an amenable number.

690989597 is a deficient number, since it is larger than the sum of its proper divisors (22290019).

690989597 is a wasteful number, since it uses less digits than its factorization.

690989597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22290018.

The product of its (nonzero) digits is 11022480, while the sum is 62.

The square root of 690989597 is about 26286.6809810596. The cubic root of 690989597 is about 884.0778363006.

The spelling of 690989597 in words is "six hundred ninety million, nine hundred eighty-nine thousand, five hundred ninety-seven".