31880691 has 24 divisors (see below), whose sum is σ = 48331296. Its totient is φ = 20211840.

The previous prime is 31880671. The next prime is 31880731. The reversal of 31880691 is 19608813.

It is not a de Polignac number, because 31880691 - 2⁵ = 31880659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31880621) 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 23 ways as a sum of consecutive naturals, for example, 47901 + ... + 48561.

It is an arithmetic number, because the mean of its divisors is an integer number (2013804).

Almost surely, 2^31880691 is an apocalyptic number.

31880691 is a deficient number, since it is larger than the sum of its proper divisors (16450605).

31880691 is a wasteful number, since it uses less digits than its factorization.

31880691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 31880691 is about 5646.2988762551. The cubic root of 31880691 is about 317.0851539422.

The spelling of 31880691 in words is "thirty-one million, eight hundred eighty thousand, six hundred ninety-one".