81603315 has 96 divisors (see below), whose sum is σ = 163010880. Its totient is φ = 38568960.

The previous prime is 81603257. The next prime is 81603317. The reversal of 81603315 is 51330618.

It is not a de Polignac number, because 81603315 - 2⁶ = 81603251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81603317) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2205477 + ... + 2205513.

It is an arithmetic number, because the mean of its divisors is an integer number (1698030).

Almost surely, 2^81603315 is an apocalyptic number.

81603315 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81603315 is a deficient number, since it is larger than the sum of its proper divisors (81407565).

81603315 is a wasteful number, since it uses less digits than its factorization.

81603315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 81603315 is about 9033.4553189796. The cubic root of 81603315 is about 433.7464505408.

It can be divided in two parts, 81603 and 315, that added together give a palindrome (81918).

The spelling of 81603315 in words is "eighty-one million, six hundred three thousand, three hundred fifteen".