312556138 has 4 divisors (see below), whose sum is σ = 468834210. Its totient is φ = 156278068.

The previous prime is 312556133. The next prime is 312556141. The reversal of 312556138 is 831655213.

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

It can be written as a sum of positive squares in only one way, i.e., 292512609 + 20043529 = 17103^2 + 4477^2 .

It is not an unprimeable number, because it can be changed into a prime (312556133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78139033 + ... + 78139036.

Almost surely, 2^312556138 is an apocalyptic number.

312556138 is a deficient number, since it is larger than the sum of its proper divisors (156278072).

312556138 is a wasteful number, since it uses less digits than its factorization.

312556138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156278071.

The product of its digits is 21600, while the sum is 34.

The square root of 312556138 is about 17679.2572807796. The cubic root of 312556138 is about 678.6450369094.

The spelling of 312556138 in words is "three hundred twelve million, five hundred fifty-six thousand, one hundred thirty-eight".