315221505 has 16 divisors (see below), whose sum is σ = 509350464. Its totient is φ = 166452800.

The previous prime is 315221471. The next prime is 315221513. The reversal of 315221505 is 505122513.

It is a happy number.

It is not a de Polignac number, because 315221505 - 2⁷ = 315221377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102519 + ... + 105548.

It is an arithmetic number, because the mean of its divisors is an integer number (31834404).

Almost surely, 2^315221505 is an apocalyptic number.

It is an amenable number.

315221505 is a deficient number, since it is larger than the sum of its proper divisors (194128959).

315221505 is a wasteful number, since it uses less digits than its factorization.

315221505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208176.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 315221505 is about 17754.4784491125. The cubic root of 315221505 is about 680.5686599861.

The spelling of 315221505 in words is "three hundred fifteen million, two hundred twenty-one thousand, five hundred five".