31970137 has 2 divisors, whose sum is σ = 31970138. Its totient is φ = 31970136.

The previous prime is 31970111. The next prime is 31970143. The reversal of 31970137 is 73107913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27081616 + 4888521 = 5204^2 + 2211^2 .

It is a cyclic number.

It is not a de Polignac number, because 31970137 - 2⁷ = 31970009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31970099 and 31970108.

It is not a weakly prime, because it can be changed into another prime (31970167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15985068 + 15985069.

It is an arithmetic number, because the mean of its divisors is an integer number (15985069).

Almost surely, 2^31970137 is an apocalyptic number.

It is an amenable number.

31970137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31970137 is an equidigital number, since it uses as much as digits as its factorization.

31970137 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 31970137 is about 5654.2140921617. The cubic root of 31970137 is about 317.3814201613.

The spelling of 31970137 in words is "thirty-one million, nine hundred seventy thousand, one hundred thirty-seven".