81596851 has 8 divisors (see below), whose sum is σ = 93322080. Its totient is φ = 69888768.

The previous prime is 81596819. The next prime is 81596863. The reversal of 81596851 is 15869518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81596851 - 2⁵ = 81596819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81596798 and 81596807.

It is not an unprimeable number, because it can be changed into a prime (81596551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8445 + ... + 15313.

It is an arithmetic number, because the mean of its divisors is an integer number (11665260).

Almost surely, 2^81596851 is an apocalyptic number.

81596851 is a deficient number, since it is larger than the sum of its proper divisors (11725229).

81596851 is a wasteful number, since it uses less digits than its factorization.

81596851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8573.

The product of its digits is 86400, while the sum is 43.

The square root of 81596851 is about 9033.0975307477. The cubic root of 81596851 is about 433.7349975294.

The spelling of 81596851 in words is "eighty-one million, five hundred ninety-six thousand, eight hundred fifty-one".