31956137 has 2 divisors, whose sum is σ = 31956138. Its totient is φ = 31956136.

The previous prime is 31956109. The next prime is 31956149. The reversal of 31956137 is 73165913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20693401 + 11262736 = 4549^2 + 3356^2 .

It is a cyclic number.

It is not a de Polignac number, because 31956137 - 2²⁴ = 15178921 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31956097 and 31956106.

It is not a weakly prime, because it can be changed into another prime (31956167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15978068 + 15978069.

It is an arithmetic number, because the mean of its divisors is an integer number (15978069).

Almost surely, 2^31956137 is an apocalyptic number.

It is an amenable number.

31956137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31956137 is an equidigital number, since it uses as much as digits as its factorization.

31956137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 35.

The square root of 31956137 is about 5652.9759419265. The cubic root of 31956137 is about 317.3350853725.

The spelling of 31956137 in words is "thirty-one million, nine hundred fifty-six thousand, one hundred thirty-seven".