315250421 has 4 divisors (see below), whose sum is σ = 315332844. Its totient is φ = 315168000.

The previous prime is 315250399. The next prime is 315250457. The reversal of 315250421 is 124052513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194909521 + 120340900 = 13961^2 + 10970^2 .

It is a cyclic number.

It is not a de Polignac number, because 315250421 - 2¹⁴ = 315234037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315210421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35180 + ... + 43221.

It is an arithmetic number, because the mean of its divisors is an integer number (78833211).

Almost surely, 2^315250421 is an apocalyptic number.

It is an amenable number.

315250421 is a deficient number, since it is larger than the sum of its proper divisors (82423).

315250421 is an equidigital number, since it uses as much as digits as its factorization.

315250421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82422.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 315250421 is about 17755.2927601884. The cubic root of 315250421 is about 680.5894693973.

The spelling of 315250421 in words is "three hundred fifteen million, two hundred fifty thousand, four hundred twenty-one".