31047923 has 2 divisors, whose sum is σ = 31047924. Its totient is φ = 31047922.

The previous prime is 31047859. The next prime is 31047943. The reversal of 31047923 is 32974013.

It is a strong prime.

It is an emirp because it is prime and its reverse (32974013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31047923 - 2⁶ = 31047859 is a prime.

It is a super-2 number, since 2×31047923² = 1927947045227858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31047943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15523961 + 15523962.

It is an arithmetic number, because the mean of its divisors is an integer number (15523962).

Almost surely, 2^31047923 is an apocalyptic number.

31047923 is a deficient number, since it is larger than the sum of its proper divisors (1).

31047923 is an equidigital number, since it uses as much as digits as its factorization.

31047923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 31047923 is about 5572.0663133168. The cubic root of 31047923 is about 314.2998575788.

The spelling of 31047923 in words is "thirty-one million, forty-seven thousand, nine hundred twenty-three".