312525217 has 2 divisors, whose sum is σ = 312525218. Its totient is φ = 312525216.

The previous prime is 312525181. The next prime is 312525221. The reversal of 312525217 is 712525213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285474816 + 27050401 = 16896^2 + 5201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312525217 is a prime.

It is a super-2 number, since 2×312525217² = 195344022521794178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312525617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156262608 + 156262609.

It is an arithmetic number, because the mean of its divisors is an integer number (156262609).

Almost surely, 2^312525217 is an apocalyptic number.

It is an amenable number.

312525217 is a deficient number, since it is larger than the sum of its proper divisors (1).

312525217 is an equidigital number, since it uses as much as digits as its factorization.

312525217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 28.

The square root of 312525217 is about 17678.3827597436. The cubic root of 312525217 is about 678.6226568495.

The spelling of 312525217 in words is "three hundred twelve million, five hundred twenty-five thousand, two hundred seventeen".