81613883 has 8 divisors (see below), whose sum is σ = 88585728. Its totient is φ = 74741184.

The previous prime is 81613877. The next prime is 81613901. The reversal of 81613883 is 38831618.

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 81613883 - 2²⁰ = 80565307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81613813) 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, 23066 + ... + 26367.

It is an arithmetic number, because the mean of its divisors is an integer number (11073216).

Almost surely, 2^81613883 is an apocalyptic number.

81613883 is a deficient number, since it is larger than the sum of its proper divisors (6971845).

81613883 is a wasteful number, since it uses less digits than its factorization.

81613883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49573.

The product of its digits is 27648, while the sum is 38.

The square root of 81613883 is about 9034.0402367933. The cubic root of 81613883 is about 433.7651737778.

The spelling of 81613883 in words is "eighty-one million, six hundred thirteen thousand, eight hundred eighty-three".