312528471881 has 4 divisors (see below), whose sum is σ = 312692358672. Its totient is φ = 312364585092.

The previous prime is 312528471863. The next prime is 312528471887. The reversal of 312528471881 is 188174825213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312528471881 - 2¹⁸ = 312528209737 is a prime.

It is a super-2 number, since 2×312528471881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312528471887) 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, 81940535 + ... + 81944348.

It is an arithmetic number, because the mean of its divisors is an integer number (78173089668).

Almost surely, 2^312528471881 is an apocalyptic number.

It is an amenable number.

312528471881 is a deficient number, since it is larger than the sum of its proper divisors (163886791).

312528471881 is a wasteful number, since it uses less digits than its factorization.

312528471881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163886790.

The product of its digits is 860160, while the sum is 50.

The spelling of 312528471881 in words is "three hundred twelve billion, five hundred twenty-eight million, four hundred seventy-one thousand, eight hundred eighty-one".