31312123011251 has 2 divisors, whose sum is σ = 31312123011252. Its totient is φ = 31312123011250.

The previous prime is 31312123011217. The next prime is 31312123011259. The reversal of 31312123011251 is 15211032121313.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31312123011251 - 2²² = 31312118816947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31312123011251.

It is not a weakly prime, because it can be changed into another prime (31312123011259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656061505625 + 15656061505626.

It is an arithmetic number, because the mean of its divisors is an integer number (15656061505626).

Almost surely, 2^{31312123011251} is an apocalyptic number.

31312123011251 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312123011251 is an equidigital number, since it uses as much as digits as its factorization.

31312123011251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 31312123011251 its reverse (15211032121313), we get a palindrome (46523155132564).

The spelling of 31312123011251 in words is "thirty-one trillion, three hundred twelve billion, one hundred twenty-three million, eleven thousand, two hundred fifty-one".