31222957 has 2 divisors, whose sum is σ = 31222958. Its totient is φ = 31222956.

The previous prime is 31222951. The next prime is 31222973. The reversal of 31222957 is 75922213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26409321 + 4813636 = 5139^2 + 2194^2 .

It is an emirp because it is prime and its reverse (75922213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31222957 - 2³ = 31222949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31222951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611478 + 15611479.

It is an arithmetic number, because the mean of its divisors is an integer number (15611479).

Almost surely, 2^31222957 is an apocalyptic number.

It is an amenable number.

31222957 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222957 is an equidigital number, since it uses as much as digits as its factorization.

31222957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 31222957 is about 5587.7506207776. The cubic root of 31222957 is about 314.8893774656.

The spelling of 31222957 in words is "thirty-one million, two hundred twenty-two thousand, nine hundred fifty-seven".