31108724947 has 4 divisors (see below), whose sum is σ = 32746026280. Its totient is φ = 29471423616.

The previous prime is 31108724923. The next prime is 31108724971. The reversal of 31108724947 is 74942780113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74942780113 = 29 ⋅2584233797.

It is an interprime number because it is at equal distance from previous prime (31108724923) and next prime (31108724971).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31108724947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31108724897 and 31108724906.

It is not an unprimeable number, because it can be changed into a prime (31108722947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818650638 + ... + 818650675.

It is an arithmetic number, because the mean of its divisors is an integer number (8186506570).

Almost surely, 2^31108724947 is an apocalyptic number.

31108724947 is a deficient number, since it is larger than the sum of its proper divisors (1637301333).

31108724947 is a wasteful number, since it uses less digits than its factorization.

31108724947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637301332.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 31108724947 in words is "thirty-one billion, one hundred eight million, seven hundred twenty-four thousand, nine hundred forty-seven".