81934275 has 24 divisors (see below), whose sum is σ = 135755200. Its totient is φ = 43604640.

The previous prime is 81934273. The next prime is 81934283. The reversal of 81934275 is 57243918.

It is not a de Polignac number, because 81934275 - 2¹ = 81934273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81934273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47376 + ... + 49074.

Almost surely, 2^81934275 is an apocalyptic number.

81934275 is a deficient number, since it is larger than the sum of its proper divisors (53820925).

81934275 is a wasteful number, since it uses less digits than its factorization.

81934275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355 (or 2350 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 81934275 is about 9051.7553546260. The cubic root of 81934275 is about 434.3320439553.

The spelling of 81934275 in words is "eighty-one million, nine hundred thirty-four thousand, two hundred seventy-five".