315421531 has 2 divisors, whose sum is σ = 315421532. Its totient is φ = 315421530.

The previous prime is 315421511. The next prime is 315421541. The reversal of 315421531 is 135124513.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315421531 - 2⁹ = 315421019 is a prime.

It is a super-2 number, since 2×315421531² = 198981484436767922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315421496 and 315421505.

It is not a weakly prime, because it can be changed into another prime (315421501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157710765 + 157710766.

It is an arithmetic number, because the mean of its divisors is an integer number (157710766).

Almost surely, 2^315421531 is an apocalyptic number.

315421531 is a deficient number, since it is larger than the sum of its proper divisors (1).

315421531 is an equidigital number, since it uses as much as digits as its factorization.

315421531 is an odious number, because the sum of its binary digits is odd.

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

The square root of 315421531 is about 17760.1106697002. The cubic root of 315421531 is about 680.7125827414.

The spelling of 315421531 in words is "three hundred fifteen million, four hundred twenty-one thousand, five hundred thirty-one".