31978475 has 12 divisors (see below), whose sum is σ = 40065144. Its totient is φ = 25317120.

The previous prime is 31978469. The next prime is 31978511. The reversal of 31978475 is 57487913.

It is not a de Polignac number, because 31978475 - 2¹⁶ = 31912939 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4169 + ... + 9018.

It is an arithmetic number, because the mean of its divisors is an integer number (3338762).

Almost surely, 2^31978475 is an apocalyptic number.

31978475 is a deficient number, since it is larger than the sum of its proper divisors (8086669).

31978475 is a wasteful number, since it uses less digits than its factorization.

31978475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13294 (or 13289 counting only the distinct ones).

The product of its digits is 211680, while the sum is 44.

The square root of 31978475 is about 5654.9513702595. The cubic root of 31978475 is about 317.4090094107.

The spelling of 31978475 in words is "thirty-one million, nine hundred seventy-eight thousand, four hundred seventy-five".