81852291 has 12 divisors (see below), whose sum is σ = 118418560. Its totient is φ = 54481680.

The previous prime is 81852283. The next prime is 81852311. The reversal of 81852291 is 19225818.

It is not a de Polignac number, because 81852291 - 2³ = 81852283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81852391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 931 + ... + 12828.

Almost surely, 2^81852291 is an apocalyptic number.

81852291 is a deficient number, since it is larger than the sum of its proper divisors (36566269).

81852291 is a wasteful number, since it uses less digits than its factorization.

81852291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14426 (or 14423 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 81852291 is about 9047.2255968335. The cubic root of 81852291 is about 434.1871303990.

The spelling of 81852291 in words is "eighty-one million, eight hundred fifty-two thousand, two hundred ninety-one".