31255656361 has 4 divisors (see below), whose sum is σ = 31334386372. Its totient is φ = 31176926352.

The previous prime is 31255656331. The next prime is 31255656379. The reversal of 31255656361 is 16365655213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16365655213 = 193 ⋅84796141.

It can be written as a sum of positive squares in 2 ways, for example, as 26634240000 + 4621416361 = 163200^2 + 67981^2 .

It is a cyclic number.

It is not a de Polignac number, because 31255656361 - 2⁷ = 31255656233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31255656331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39364410 + ... + 39365203.

It is an arithmetic number, because the mean of its divisors is an integer number (7833596593).

Almost surely, 2^31255656361 is an apocalyptic number.

It is an amenable number.

31255656361 is a deficient number, since it is larger than the sum of its proper divisors (78730011).

31255656361 is an equidigital number, since it uses as much as digits as its factorization.

31255656361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78730010.

The product of its digits is 486000, while the sum is 43.

The spelling of 31255656361 in words is "thirty-one billion, two hundred fifty-five million, six hundred fifty-six thousand, three hundred sixty-one".