312081138 has 24 divisors (see below), whose sum is σ = 715951548. Its totient is φ = 97907712.

The previous prime is 312081131. The next prime is 312081163. The reversal of 312081138 is 831180213.

It can be written as a sum of positive squares in 2 ways, for example, as 299739969 + 12341169 = 17313^2 + 3513^2 .

It is not an unprimeable number, because it can be changed into a prime (312081131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 509631 + ... + 510242.

Almost surely, 2^312081138 is an apocalyptic number.

312081138 is an abundant number, since it is smaller than the sum of its proper divisors (403870410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312081138 is a wasteful number, since it uses less digits than its factorization.

312081138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019898 (or 1019895 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 312081138 is about 17665.8183507020. The cubic root of 312081138 is about 678.3010775484.

The spelling of 312081138 in words is "three hundred twelve million, eighty-one thousand, one hundred thirty-eight".