312540217 has 12 divisors (see below), whose sum is σ = 344333808. Its totient is φ = 283467800.

The previous prime is 312540209. The next prime is 312540247. The reversal of 312540217 is 712045213.

It is a happy number.

It is not a de Polignac number, because 312540217 - 2³ = 312540209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312540191 and 312540200.

It is not an unprimeable number, because it can be changed into a prime (312540247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53742 + ... + 59272.

It is an arithmetic number, because the mean of its divisors is an integer number (28694484).

Almost surely, 2^312540217 is an apocalyptic number.

It is an amenable number.

312540217 is a deficient number, since it is larger than the sum of its proper divisors (31793591).

312540217 is a wasteful number, since it uses less digits than its factorization.

312540217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6020 (or 6009 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 312540217 is about 17678.8070016051. The cubic root of 312540217 is about 678.6335137622.

The spelling of 312540217 in words is "three hundred twelve million, five hundred forty thousand, two hundred seventeen".