312406421 has 2 divisors, whose sum is σ = 312406422. Its totient is φ = 312406420.

The previous prime is 312406307. The next prime is 312406427. The reversal of 312406421 is 124604213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208080625 + 104325796 = 14425^2 + 10214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312406421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312406427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156203210 + 156203211.

It is an arithmetic number, because the mean of its divisors is an integer number (156203211).

Almost surely, 2^312406421 is an apocalyptic number.

It is an amenable number.

312406421 is a deficient number, since it is larger than the sum of its proper divisors (1).

312406421 is an equidigital number, since it uses as much as digits as its factorization.

312406421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 312406421 is about 17675.0225176660. The cubic root of 312406421 is about 678.5366607233.

The spelling of 312406421 in words is "three hundred twelve million, four hundred six thousand, four hundred twenty-one".