51312221315 has 4 divisors (see below), whose sum is σ = 61574665584. Its totient is φ = 41049777048.

The previous prime is 51312221291. The next prime is 51312221327.

51312221315 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51312221315 - 2¹² = 51312217219 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 5131222127 + ... + 5131222136.

It is an arithmetic number, because the mean of its divisors is an integer number (15393666396).

Almost surely, 2^51312221315 is an apocalyptic number.

51312221315 is a deficient number, since it is larger than the sum of its proper divisors (10262444269).

51312221315 is a wasteful number, since it uses less digits than its factorization.

51312221315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262444268.

The product of its digits is 1800, while the sum is 26.

The spelling of 51312221315 in words is "fifty-one billion, three hundred twelve million, two hundred twenty-one thousand, three hundred fifteen".