312501389 has 2 divisors, whose sum is σ = 312501390. Its totient is φ = 312501388.

The previous prime is 312501377. The next prime is 312501433. The reversal of 312501389 is 983105213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238455364 + 74046025 = 15442^2 + 8605^2 .

It is a cyclic number.

It is not a de Polignac number, because 312501389 - 2²⁴ = 295724173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312501349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156250694 + 156250695.

It is an arithmetic number, because the mean of its divisors is an integer number (156250695).

Almost surely, 2^312501389 is an apocalyptic number.

It is an amenable number.

312501389 is a deficient number, since it is larger than the sum of its proper divisors (1).

312501389 is an equidigital number, since it uses as much as digits as its factorization.

312501389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 312501389 is about 17677.7088164728. The cubic root of 312501389 is about 678.6054095675.

The spelling of 312501389 in words is "three hundred twelve million, five hundred one thousand, three hundred eighty-nine".