31057493 has 2 divisors, whose sum is σ = 31057494. Its totient is φ = 31057492.

The previous prime is 31057483. The next prime is 31057501. The reversal of 31057493 is 39475013.

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., 29669809 + 1387684 = 5447^2 + 1178^2 .

It is an emirp because it is prime and its reverse (39475013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31057493 - 2⁸ = 31057237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31057483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15528746 + 15528747.

It is an arithmetic number, because the mean of its divisors is an integer number (15528747).

Almost surely, 2^31057493 is an apocalyptic number.

It is an amenable number.

31057493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31057493 is an equidigital number, since it uses as much as digits as its factorization.

31057493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 31057493 is about 5572.9249950094. The cubic root of 31057493 is about 314.3321468095.

The spelling of 31057493 in words is "thirty-one million, fifty-seven thousand, four hundred ninety-three".