315224381 has 2 divisors, whose sum is σ = 315224382. Its totient is φ = 315224380.

The previous prime is 315224369. The next prime is 315224401. The reversal of 315224381 is 183422513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179292100 + 135932281 = 13390^2 + 11659^2 .

It is a cyclic number.

It is not a de Polignac number, because 315224381 - 2⁶ = 315224317 is a prime.

It is a super-2 number, since 2×315224381² = 198732820753666322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315224321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157612190 + 157612191.

It is an arithmetic number, because the mean of its divisors is an integer number (157612191).

Almost surely, 2^315224381 is an apocalyptic number.

It is an amenable number.

315224381 is a deficient number, since it is larger than the sum of its proper divisors (1).

315224381 is an equidigital number, since it uses as much as digits as its factorization.

315224381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 315224381 is about 17754.5594425770. The cubic root of 315224381 is about 680.5707297577.

Adding to 315224381 its reverse (183422513), we get a palindrome (498646894).

The spelling of 315224381 in words is "three hundred fifteen million, two hundred twenty-four thousand, three hundred eighty-one".