31396957 has 2 divisors, whose sum is σ = 31396958. Its totient is φ = 31396956.

The previous prime is 31396933. The next prime is 31396993. The reversal of 31396957 is 75969313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17214201 + 14182756 = 4149^2 + 3766^2 .

It is a cyclic number.

It is not a de Polignac number, because 31396957 - 2¹⁵ = 31364189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31396997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15698478 + 15698479.

It is an arithmetic number, because the mean of its divisors is an integer number (15698479).

Almost surely, 2^31396957 is an apocalyptic number.

It is an amenable number.

31396957 is a deficient number, since it is larger than the sum of its proper divisors (1).

31396957 is an equidigital number, since it uses as much as digits as its factorization.

31396957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 43.

The square root of 31396957 is about 5603.2987605517. The cubic root of 31396957 is about 315.4732351050.

The spelling of 31396957 in words is "thirty-one million, three hundred ninety-six thousand, nine hundred fifty-seven".