690961331 has 16 divisors (see below), whose sum is σ = 737856000. Its totient is φ = 645615168.

The previous prime is 690961307. The next prime is 690961357. The reversal of 690961331 is 133169096.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690961331 is a prime.

It is a super-2 number, since 2×690961331² = 954855121874583122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690961031) 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, 225095 + ... + 228143.

It is an arithmetic number, because the mean of its divisors is an integer number (46116000).

Almost surely, 2^690961331 is an apocalyptic number.

690961331 is a deficient number, since it is larger than the sum of its proper divisors (46894669).

690961331 is a wasteful number, since it uses less digits than its factorization.

690961331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 690961331 is about 26286.1433268557. The cubic root of 690961331 is about 884.0657812784.

The spelling of 690961331 in words is "six hundred ninety million, nine hundred sixty-one thousand, three hundred thirty-one".