31970531 has 2 divisors, whose sum is σ = 31970532. Its totient is φ = 31970530.

The previous prime is 31970513. The next prime is 31970537. The reversal of 31970531 is 13507913.

Together with previous prime (31970513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31970531 - 2¹⁴ = 31954147 is a prime.

It is a super-2 number, since 2×31970531² = 2044229704843922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31970494 and 31970503.

It is not a weakly prime, because it can be changed into another prime (31970537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15985265 + 15985266.

It is an arithmetic number, because the mean of its divisors is an integer number (15985266).

Almost surely, 2^31970531 is an apocalyptic number.

31970531 is a deficient number, since it is larger than the sum of its proper divisors (1).

31970531 is an equidigital number, since it uses as much as digits as its factorization.

31970531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 29.

The square root of 31970531 is about 5654.2489333244. The cubic root of 31970531 is about 317.3827239589.

The spelling of 31970531 in words is "thirty-one million, nine hundred seventy thousand, five hundred thirty-one".