312265889881 has 4 divisors (see below), whose sum is σ = 340653698064. Its totient is φ = 283878081700.

The previous prime is 312265889867. The next prime is 312265889893. The reversal of 312265889881 is 188988562213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 188988562213 = 11 ⋅17180778383.

It is a cyclic number.

It is not a de Polignac number, because 312265889881 - 2⁵ = 312265889849 is a prime.

It is a super-2 number, since 2×312265889881² (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 (312265889081) 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, 14193904075 + ... + 14193904096.

It is an arithmetic number, because the mean of its divisors is an integer number (85163424516).

Almost surely, 2^312265889881 is an apocalyptic number.

It is an amenable number.

312265889881 is a deficient number, since it is larger than the sum of its proper divisors (28387808183).

312265889881 is a wasteful number, since it uses less digits than its factorization.

312265889881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28387808182.

The product of its digits is 13271040, while the sum is 61.

The spelling of 312265889881 in words is "three hundred twelve billion, two hundred sixty-five million, eight hundred eighty-nine thousand, eight hundred eighty-one".