312128977 has 4 divisors (see below), whose sum is σ = 312491520. Its totient is φ = 311766436.

The previous prime is 312128969. The next prime is 312128989. The reversal of 312128977 is 779821213.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 312128977 - 2³ = 312128969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312122977) 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, 179977 + ... + 181702.

It is an arithmetic number, because the mean of its divisors is an integer number (78122880).

Almost surely, 2^312128977 is an apocalyptic number.

It is an amenable number.

312128977 is a deficient number, since it is larger than the sum of its proper divisors (362543).

312128977 is an equidigital number, since it uses as much as digits as its factorization.

312128977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362542.

The product of its digits is 42336, while the sum is 40.

The square root of 312128977 is about 17667.1722977957. The cubic root of 312128977 is about 678.3357347613.

The spelling of 312128977 in words is "three hundred twelve million, one hundred twenty-eight thousand, nine hundred seventy-seven".