690169531 has 2 divisors, whose sum is σ = 690169532. Its totient is φ = 690169530.

The previous prime is 690169499. The next prime is 690169537. The reversal of 690169531 is 135961096.

690169531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690169531 - 2⁵ = 690169499 is a prime.

It is a super-2 number, since 2×690169531² = 952667963041519922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (690169537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345084765 + 345084766.

It is an arithmetic number, because the mean of its divisors is an integer number (345084766).

Almost surely, 2^690169531 is an apocalyptic number.

690169531 is a deficient number, since it is larger than the sum of its proper divisors (1).

690169531 is an equidigital number, since it uses as much as digits as its factorization.

690169531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 690169531 is about 26271.0778423726. The cubic root of 690169531 is about 883.7279568533.

The spelling of 690169531 in words is "six hundred ninety million, one hundred sixty-nine thousand, five hundred thirty-one".