312120139 has 2 divisors, whose sum is σ = 312120140. Its totient is φ = 312120138.

The previous prime is 312120131. The next prime is 312120169. The reversal of 312120139 is 931021213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312120139 - 2³ = 312120131 is a prime.

It is not a weakly prime, because it can be changed into another prime (312120131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156060069 + 156060070.

It is an arithmetic number, because the mean of its divisors is an integer number (156060070).

Almost surely, 2^312120139 is an apocalyptic number.

312120139 is a deficient number, since it is larger than the sum of its proper divisors (1).

312120139 is an equidigital number, since it uses as much as digits as its factorization.

312120139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 312120139 is about 17666.9221711084. The cubic root of 312120139 is about 678.3293322929.

The spelling of 312120139 in words is "three hundred twelve million, one hundred twenty thousand, one hundred thirty-nine".