312156139 has 2 divisors, whose sum is σ = 312156140. Its totient is φ = 312156138.

The previous prime is 312156137. The next prime is 312156179. The reversal of 312156139 is 931651213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312156139 - 2¹ = 312156137 is a prime.

Together with 312156137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 312156139.

It is not a weakly prime, because it can be changed into another prime (312156133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156078069 + 156078070.

It is an arithmetic number, because the mean of its divisors is an integer number (156078070).

Almost surely, 2^312156139 is an apocalyptic number.

312156139 is a deficient number, since it is larger than the sum of its proper divisors (1).

312156139 is an equidigital number, since it uses as much as digits as its factorization.

312156139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 31.

The square root of 312156139 is about 17667.9409949207. The cubic root of 312156139 is about 678.3554108377.

The spelling of 312156139 in words is "three hundred twelve million, one hundred fifty-six thousand, one hundred thirty-nine".