31225457 has 2 divisors, whose sum is σ = 31225458. Its totient is φ = 31225456.

The previous prime is 31225429. The next prime is 31225459. The reversal of 31225457 is 75452213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27836176 + 3389281 = 5276^2 + 1841^2 .

It is a cyclic number.

It is not a de Polignac number, because 31225457 - 2⁶ = 31225393 is a prime.

Together with 31225459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31225459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612728 + 15612729.

It is an arithmetic number, because the mean of its divisors is an integer number (15612729).

Almost surely, 2^31225457 is an apocalyptic number.

It is an amenable number.

31225457 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225457 is an equidigital number, since it uses as much as digits as its factorization.

31225457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 29.

The square root of 31225457 is about 5587.9743199124. The cubic root of 31225457 is about 314.8977815642.

The spelling of 31225457 in words is "thirty-one million, two hundred twenty-five thousand, four hundred fifty-seven".