312315561 has 16 divisors (see below), whose sum is σ = 464371200. Its totient is φ = 207453744.

The previous prime is 312315527. The next prime is 312315569. The reversal of 312315561 is 165513213.

It is not a de Polignac number, because 312315561 - 2⁷ = 312315433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (312315569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13401 + ... + 28358.

It is an arithmetic number, because the mean of its divisors is an integer number (29023200).

Almost surely, 2^312315561 is an apocalyptic number.

It is an amenable number.

312315561 is a deficient number, since it is larger than the sum of its proper divisors (152055639).

312315561 is a wasteful number, since it uses less digits than its factorization.

312315561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42045 (or 42039 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 312315561 is about 17672.4520369981. The cubic root of 312315561 is about 678.4708726828.

Adding to 312315561 its reverse (165513213), we get a palindrome (477828774).

The spelling of 312315561 in words is "three hundred twelve million, three hundred fifteen thousand, five hundred sixty-one".