690121131 has 16 divisors (see below), whose sum is σ = 1052045568. Its totient is φ = 394192800.

The previous prime is 690121123. The next prime is 690121139. The reversal of 690121131 is 131121096.

It is an interprime number because it is at equal distance from previous prime (690121123) and next prime (690121139).

It is not a de Polignac number, because 690121131 - 2³ = 690121123 is a prime.

It is a super-2 number, since 2×690121131² = 952534350905438322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (690121139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61636 + ... + 71966.

It is an arithmetic number, because the mean of its divisors is an integer number (65752848).

Almost surely, 2^690121131 is an apocalyptic number.

690121131 is a deficient number, since it is larger than the sum of its proper divisors (361924437).

690121131 is a wasteful number, since it uses less digits than its factorization.

690121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13522.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 690121131 is about 26270.1566611240. The cubic root of 690121131 is about 883.7072984348.

The spelling of 690121131 in words is "six hundred ninety million, one hundred twenty-one thousand, one hundred thirty-one".