81380893 has 8 divisors (see below), whose sum is σ = 90235296. Its totient is φ = 72769200.

The previous prime is 81380881. The next prime is 81380899. The reversal of 81380893 is 39808318.

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 81380893 - 2⁵ = 81380861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81380899) 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, 59971 + ... + 61312.

It is an arithmetic number, because the mean of its divisors is an integer number (11279412).

Almost surely, 2^81380893 is an apocalyptic number.

It is an amenable number.

81380893 is a deficient number, since it is larger than the sum of its proper divisors (8854403).

81380893 is a wasteful number, since it uses less digits than its factorization.

81380893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121355.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 81380893 is about 9021.1359040866. The cubic root of 81380893 is about 433.3520117524.

The spelling of 81380893 in words is "eighty-one million, three hundred eighty thousand, eight hundred ninety-three".