31297947 has 16 divisors (see below), whose sum is σ = 42549408. Its totient is φ = 20459520.

The previous prime is 31297913. The next prime is 31297951. The reversal of 31297947 is 74979213.

It is not a de Polignac number, because 31297947 - 2¹¹ = 31295899 is a prime.

It is a super-2 number, since 2×31297947² = 1959122972829618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31297899 and 31297908.

It is not an unprimeable number, because it can be changed into a prime (31297247) 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, 52483 + ... + 53075.

It is an arithmetic number, because the mean of its divisors is an integer number (2659338).

Almost surely, 2^31297947 is an apocalyptic number.

31297947 is a deficient number, since it is larger than the sum of its proper divisors (11251461).

31297947 is a wasteful number, since it uses less digits than its factorization.

31297947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910.

The product of its digits is 95256, while the sum is 42.

The square root of 31297947 is about 5594.4568100934. The cubic root of 31297947 is about 315.1412719815.

The spelling of 31297947 in words is "thirty-one million, two hundred ninety-seven thousand, nine hundred forty-seven".