315865409 has 4 divisors (see below), whose sum is σ = 321219120. Its totient is φ = 310511700.

The previous prime is 315865399. The next prime is 315865421. The reversal of 315865409 is 904568513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904568513 = 12037 ⋅75149.

It is a cyclic number.

It is not a de Polignac number, because 315865409 - 2¹² = 315861313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (315865489) 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, 2676767 + ... + 2676884.

It is an arithmetic number, because the mean of its divisors is an integer number (80304780).

Almost surely, 2^315865409 is an apocalyptic number.

It is an amenable number.

315865409 is a deficient number, since it is larger than the sum of its proper divisors (5353711).

315865409 is an equidigital number, since it uses as much as digits as its factorization.

315865409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353710.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 315865409 is about 17772.6027638047. The cubic root of 315865409 is about 681.0317447573.

The spelling of 315865409 in words is "three hundred fifteen million, eight hundred sixty-five thousand, four hundred nine".