311512255357 has 4 divisors (see below), whose sum is σ = 312313058460. Its totient is φ = 310711452256.

The previous prime is 311512255343. The next prime is 311512255363. The reversal of 311512255357 is 753552215113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 753552215113 = 17 ⋅44326600889.

It can be written as a sum of positive squares in 2 ways, for example, as 174607815321 + 136904440036 = 417861^2 + 370006^2 .

It is a cyclic number.

It is not a de Polignac number, because 311512255357 - 2²³ = 311503866749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311512255657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400400968 + ... + 400401745.

It is an arithmetic number, because the mean of its divisors is an integer number (78078264615).

Almost surely, 2^311512255357 is an apocalyptic number.

It is an amenable number.

311512255357 is a deficient number, since it is larger than the sum of its proper divisors (800803103).

311512255357 is an equidigital number, since it uses as much as digits as its factorization.

311512255357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800803102.

The product of its digits is 157500, while the sum is 40.

The spelling of 311512255357 in words is "three hundred eleven billion, five hundred twelve million, two hundred fifty-five thousand, three hundred fifty-seven".