315649 has 4 divisors (see below), whose sum is σ = 319536. Its totient is φ = 311764.

The previous prime is 315643. The next prime is 315671. The reversal of 315649 is 946513.

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.

It is a cyclic number.

It is not a de Polignac number, because 315649 - 2⁵ = 315617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315643) 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, 1819 + ... + 1984.

It is an arithmetic number, because the mean of its divisors is an integer number (79884).

2³¹⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

315649 is a deficient number, since it is larger than the sum of its proper divisors (3887).

315649 is an equidigital number, since it uses as much as digits as its factorization.

315649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886.

The product of its digits is 3240, while the sum is 28.

The square root of 315649 is about 561.8264856697. The cubic root of 315649 is about 68.0876177369.

The spelling of 315649 in words is "three hundred fifteen thousand, six hundred forty-nine".