31971073 has 2 divisors, whose sum is σ = 31971074. Its totient is φ = 31971072.

The previous prime is 31971061. The next prime is 31971083. The reversal of 31971073 is 37017913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22771984 + 9199089 = 4772^2 + 3033^2 .

It is a cyclic number.

It is not a de Polignac number, because 31971073 - 2¹⁷ = 31840001 is a prime.

It is not a weakly prime, because it can be changed into another prime (31971083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15985536 + 15985537.

It is an arithmetic number, because the mean of its divisors is an integer number (15985537).

Almost surely, 2^31971073 is an apocalyptic number.

It is an amenable number.

31971073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31971073 is an equidigital number, since it uses as much as digits as its factorization.

31971073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 31.

The square root of 31971073 is about 5654.2968616796. The cubic root of 31971073 is about 317.3845174904.

Adding to 31971073 its reverse (37017913), we get a palindrome (68988986).

The spelling of 31971073 in words is "thirty-one million, nine hundred seventy-one thousand, seventy-three".