312739109 has 4 divisors (see below), whose sum is σ = 313022220. Its totient is φ = 312456000.

The previous prime is 312739099. The next prime is 312739111. The reversal of 312739109 is 901937213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1322500 + 311416609 = 1150^2 + 17647^2 .

It is a cyclic number.

It is not a de Polignac number, because 312739109 - 2⁴ = 312739093 is a prime.

It is a super-2 number, since 2×312739109² = 195611500596227762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312739169) 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, 139892 + ... + 142109.

It is an arithmetic number, because the mean of its divisors is an integer number (78255555).

Almost surely, 2^312739109 is an apocalyptic number.

It is an amenable number.

312739109 is a deficient number, since it is larger than the sum of its proper divisors (283111).

312739109 is a wasteful number, since it uses less digits than its factorization.

312739109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283110.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 312739109 is about 17684.4312602922. The cubic root of 312739109 is about 678.7774378059. Note that the first 3 decimals are identical.

The spelling of 312739109 in words is "three hundred twelve million, seven hundred thirty-nine thousand, one hundred nine".