315315421 has 2 divisors, whose sum is σ = 315315422. Its totient is φ = 315315420.

The previous prime is 315315419. The next prime is 315315437. The reversal of 315315421 is 124513513.

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., 296218521 + 19096900 = 17211^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 315315421 - 2¹ = 315315419 is a prime.

Together with 315315419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315315401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157657710 + 157657711.

It is an arithmetic number, because the mean of its divisors is an integer number (157657711).

Almost surely, 2^315315421 is an apocalyptic number.

It is an amenable number.

315315421 is a deficient number, since it is larger than the sum of its proper divisors (1).

315315421 is an equidigital number, since it uses as much as digits as its factorization.

315315421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 315315421 is about 17757.1231059538. The cubic root of 315315421 is about 680.6362420289.

Adding to 315315421 its reverse (124513513), we get a palindrome (439828934).

The spelling of 315315421 in words is "three hundred fifteen million, three hundred fifteen thousand, four hundred twenty-one".