312640051 has 16 divisors (see below), whose sum is σ = 324172800. Its totient is φ = 301392000.

The previous prime is 312640043. The next prime is 312640061. The reversal of 312640051 is 150046213.

It is a cyclic number.

It is not a de Polignac number, because 312640051 - 2³ = 312640043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312640061) 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 in 15 ways as a sum of consecutive naturals, for example, 779451 + ... + 779851.

It is an arithmetic number, because the mean of its divisors is an integer number (20260800).

Almost surely, 2^312640051 is an apocalyptic number.

312640051 is a deficient number, since it is larger than the sum of its proper divisors (11532749).

312640051 is a wasteful number, since it uses less digits than its factorization.

312640051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 312640051 is about 17681.6303264150. The cubic root of 312640051 is about 678.7057641821.

Adding to 312640051 its reverse (150046213), we get a palindrome (462686264).

The spelling of 312640051 in words is "three hundred twelve million, six hundred forty thousand, fifty-one".