31691948 has 6 divisors (see below), whose sum is σ = 55460916. Its totient is φ = 15845972.

The previous prime is 31691941. The next prime is 31691963. The reversal of 31691948 is 84919613.

It is not an unprimeable number, because it can be changed into a prime (31691941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3961490 + ... + 3961497.

It is an arithmetic number, because the mean of its divisors is an integer number (9243486).

Almost surely, 2^31691948 is an apocalyptic number.

It is an amenable number.

31691948 is a deficient number, since it is larger than the sum of its proper divisors (23768968).

31691948 is a wasteful number, since it uses less digits than its factorization.

31691948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7922991 (or 7922989 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 31691948 is about 5629.5601959656. The cubic root of 31691948 is about 316.4581694320.

The spelling of 31691948 in words is "thirty-one million, six hundred ninety-one thousand, nine hundred forty-eight".