81893361 has 32 divisors (see below), whose sum is σ = 124830720. Its totient is φ = 47297600.

The previous prime is 81893353. The next prime is 81893393. The reversal of 81893361 is 16339818.

It is a cyclic number.

It is not a de Polignac number, because 81893361 - 2³ = 81893353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81891361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78916 + ... + 79946.

It is an arithmetic number, because the mean of its divisors is an integer number (3900960).

Almost surely, 2^81893361 is an apocalyptic number.

It is an amenable number.

81893361 is a deficient number, since it is larger than the sum of its proper divisors (42937359).

81893361 is a wasteful number, since it uses less digits than its factorization.

81893361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157.

The product of its digits is 31104, while the sum is 39.

The square root of 81893361 is about 9049.4950687870. The cubic root of 81893361 is about 434.2597371381.

The spelling of 81893361 in words is "eighty-one million, eight hundred ninety-three thousand, three hundred sixty-one".