81293315 has 16 divisors (see below), whose sum is σ = 102850560. Its totient is φ = 61592160.

The previous prime is 81293287. The next prime is 81293323. The reversal of 81293315 is 51339218.

It is not a de Polignac number, because 81293315 - 2¹⁶ = 81227779 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, 1706 + ... + 12864.

It is an arithmetic number, because the mean of its divisors is an integer number (6428160).

Almost surely, 2^81293315 is an apocalyptic number.

81293315 is a deficient number, since it is larger than the sum of its proper divisors (21557245).

81293315 is a wasteful number, since it uses less digits than its factorization.

81293315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11242.

The product of its digits is 6480, while the sum is 32.

The square root of 81293315 is about 9016.2805524229. The cubic root of 81293315 is about 433.1965054524.

The spelling of 81293315 in words is "eighty-one million, two hundred ninety-three thousand, three hundred fifteen".