315643906 has 4 divisors (see below), whose sum is σ = 473465862. Its totient is φ = 157821952.

The previous prime is 315643883. The next prime is 315643943. The reversal of 315643906 is 609346513.

315643906 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 223771681 + 91872225 = 14959^2 + 9585^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78910975 + ... + 78910978.

Almost surely, 2^315643906 is an apocalyptic number.

315643906 is a deficient number, since it is larger than the sum of its proper divisors (157821956).

315643906 is a wasteful number, since it uses less digits than its factorization.

315643906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157821955.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 315643906 is about 17766.3700850793. The cubic root of 315643906 is about 680.8725146488.

The spelling of 315643906 in words is "three hundred fifteen million, six hundred forty-three thousand, nine hundred six".