31961090 has 16 divisors (see below), whose sum is σ = 65748672. Its totient is φ = 10958064.

The previous prime is 31961087. The next prime is 31961107. The reversal of 31961090 is 9016913.

31961090 = 3263² + 3264² + 3265².

It is a super-2 number, since 2×31961090² = 2043022547976200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228224 + ... + 228363.

It is an arithmetic number, because the mean of its divisors is an integer number (4109292).

Almost surely, 2^31961090 is an apocalyptic number.

31961090 is an abundant number, since it is smaller than the sum of its proper divisors (33787582).

31961090 is a wasteful number, since it uses less digits than its factorization.

31961090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456601.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 31961090 is about 5653.4140127891. The cubic root of 31961090 is about 317.3514795055.

The spelling of 31961090 in words is "thirty-one million, nine hundred sixty-one thousand, ninety".