31055971 has 2 divisors, whose sum is σ = 31055972. Its totient is φ = 31055970.

The previous prime is 31055929. The next prime is 31055977. The reversal of 31055971 is 17955013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31055971 - 2²³ = 22667363 is a prime.

It is not a weakly prime, because it can be changed into another prime (31055977) 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, 15527985 + 15527986.

It is an arithmetic number, because the mean of its divisors is an integer number (15527986).

Almost surely, 2^31055971 is an apocalyptic number.

31055971 is a deficient number, since it is larger than the sum of its proper divisors (1).

31055971 is an equidigital number, since it uses as much as digits as its factorization.

31055971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 31055971 is about 5572.7884402694. The cubic root of 31055971 is about 314.3270120171.

The spelling of 31055971 in words is "thirty-one million, fifty-five thousand, nine hundred seventy-one".