312236921 has 2 divisors, whose sum is σ = 312236922. Its totient is φ = 312236920.

The previous prime is 312236849. The next prime is 312236957. The reversal of 312236921 is 129632213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302377321 + 9859600 = 17389^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 312236921 - 2¹⁸ = 311974777 is a prime.

It is a super-3 number, since 3×312236921³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (312236971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156118460 + 156118461.

It is an arithmetic number, because the mean of its divisors is an integer number (156118461).

Almost surely, 2^312236921 is an apocalyptic number.

It is an amenable number.

312236921 is a deficient number, since it is larger than the sum of its proper divisors (1).

312236921 is an equidigital number, since it uses as much as digits as its factorization.

312236921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 312236921 is about 17670.2269651524. The cubic root of 312236921 is about 678.4139223469.

The spelling of 312236921 in words is "three hundred twelve million, two hundred thirty-six thousand, nine hundred twenty-one".