31353413257 has 4 divisors (see below), whose sum is σ = 31372901140. Its totient is φ = 31333925376.

The previous prime is 31353413251. The next prime is 31353413297. The reversal of 31353413257 is 75231435313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75231435313 = 19 ⋅3959549227.

It can be written as a sum of positive squares in 2 ways, for example, as 27814234176 + 3539179081 = 166776^2 + 59491^2 .

It is a cyclic number.

It is not a de Polignac number, because 31353413257 - 2¹⁵ = 31353380489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31353413251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9741528 + ... + 9744745.

It is an arithmetic number, because the mean of its divisors is an integer number (7843225285).

Almost surely, 2^31353413257 is an apocalyptic number.

It is an amenable number.

31353413257 is a deficient number, since it is larger than the sum of its proper divisors (19487883).

31353413257 is a wasteful number, since it uses less digits than its factorization.

31353413257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19487882.

The product of its digits is 113400, while the sum is 37.

The spelling of 31353413257 in words is "thirty-one billion, three hundred fifty-three million, four hundred thirteen thousand, two hundred fifty-seven".