81353315 has 4 divisors (see below), whose sum is σ = 97623984. Its totient is φ = 65082648.

The previous prime is 81353309. The next prime is 81353341. The reversal of 81353315 is 51335318.

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

It is a cyclic number.

It is not a de Polignac number, because 81353315 - 2¹⁰ = 81352291 is a prime.

It is a super-2 number, since 2×81353315² = 13236723722978450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8135327 + ... + 8135336.

It is an arithmetic number, because the mean of its divisors is an integer number (24405996).

Almost surely, 2^81353315 is an apocalyptic number.

81353315 is a deficient number, since it is larger than the sum of its proper divisors (16270669).

81353315 is a wasteful number, since it uses less digits than its factorization.

81353315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16270668.

The product of its digits is 5400, while the sum is 29.

The square root of 81353315 is about 9019.6072530903. The cubic root of 81353315 is about 433.3030554124.

The spelling of 81353315 in words is "eighty-one million, three hundred fifty-three thousand, three hundred fifteen".