690693381531 has 32 divisors (see below), whose sum is σ = 1085286746880. Its totient is φ = 432637780608.

The previous prime is 690693381527. The next prime is 690693381559. The reversal of 690693381531 is 135183396096.

It is not a de Polignac number, because 690693381531 - 2² = 690693381527 is a prime.

It is a super-2 number, since 2×690693381531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (690693381571) 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 31 ways as a sum of consecutive naturals, for example, 1012321 + ... + 1551186.

It is an arithmetic number, because the mean of its divisors is an integer number (33915210840).

Almost surely, 2^690693381531 is an apocalyptic number.

690693381531 is a deficient number, since it is larger than the sum of its proper divisors (394593365349).

690693381531 is a wasteful number, since it uses less digits than its factorization.

690693381531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564120 (or 2564114 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The spelling of 690693381531 in words is "six hundred ninety billion, six hundred ninety-three million, three hundred eighty-one thousand, five hundred thirty-one".