81795651 has 24 divisors (see below), whose sum is σ = 129576960. Its totient is φ = 45742032.

The previous prime is 81795617. The next prime is 81795667. The reversal of 81795651 is 15659718.

It is not a de Polignac number, because 81795651 - 2⁹ = 81795139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81795601) 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, 990 + ... + 12828.

It is an arithmetic number, because the mean of its divisors is an integer number (5399040).

Almost surely, 2^81795651 is an apocalyptic number.

81795651 is a deficient number, since it is larger than the sum of its proper divisors (47781309).

81795651 is a wasteful number, since it uses less digits than its factorization.

81795651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11903 (or 11896 counting only the distinct ones).

The product of its digits is 75600, while the sum is 42.

The square root of 81795651 is about 9044.0948137445. The cubic root of 81795651 is about 434.0869579485.

The spelling of 81795651 in words is "eighty-one million, seven hundred ninety-five thousand, six hundred fifty-one".