315221377 has 2 divisors, whose sum is σ = 315221378. Its totient is φ = 315221376.

The previous prime is 315221323. The next prime is 315221437. The reversal of 315221377 is 773122513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288966001 + 26255376 = 16999^2 + 5124^2 .

It is a cyclic number.

It is not a de Polignac number, because 315221377 - 2¹⁵ = 315188609 is a prime.

It is a super-2 number, since 2×315221377² = 198729033035552258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (315221317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157610688 + 157610689.

It is an arithmetic number, because the mean of its divisors is an integer number (157610689).

Almost surely, 2^315221377 is an apocalyptic number.

It is an amenable number.

315221377 is a deficient number, since it is larger than the sum of its proper divisors (1).

315221377 is an equidigital number, since it uses as much as digits as its factorization.

315221377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 31.

The square root of 315221377 is about 17754.4748443878. The cubic root of 315221377 is about 680.5685678681.

The spelling of 315221377 in words is "three hundred fifteen million, two hundred twenty-one thousand, three hundred seventy-seven".