315665493 has 32 divisors (see below), whose sum is σ = 511539840. Its totient is φ = 170499840.

The previous prime is 315665491. The next prime is 315665507. The reversal of 315665493 is 394566513.

It is not a de Polignac number, because 315665493 - 2¹ = 315665491 is a prime.

It is a super-3 number, since 3×315665493³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315665491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246 + ... + 25127.

It is an arithmetic number, because the mean of its divisors is an integer number (15985620).

Almost surely, 2^315665493 is an apocalyptic number.

315665493 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

315665493 is a deficient number, since it is larger than the sum of its proper divisors (195874347).

315665493 is a wasteful number, since it uses less digits than its factorization.

315665493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25429.

The product of its digits is 291600, while the sum is 42.

The square root of 315665493 is about 17766.9775989052. The cubic root of 315665493 is about 680.8880360002. Note that the first 3 decimals are identical.

The spelling of 315665493 in words is "three hundred fifteen million, six hundred sixty-five thousand, four hundred ninety-three".