81600371 has 16 divisors (see below), whose sum is σ = 85494528. Its totient is φ = 77834400.

The previous prime is 81600361. The next prime is 81600419. The reversal of 81600371 is 17300618.

It is a cyclic number.

It is not a de Polignac number, because 81600371 - 2¹⁴ = 81583987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81600371.

It is not an unprimeable number, because it can be changed into a prime (81600361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359360 + ... + 359586.

It is an arithmetic number, because the mean of its divisors is an integer number (5343408).

Almost surely, 2^81600371 is an apocalyptic number.

81600371 is a deficient number, since it is larger than the sum of its proper divisors (3894157).

81600371 is a wasteful number, since it uses less digits than its factorization.

81600371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 81600371 is about 9033.2923676808. The cubic root of 81600371 is about 433.7412343928.

Adding to 81600371 its reverse (17300618), we get a palindrome (98900989).

The spelling of 81600371 in words is "eighty-one million, six hundred thousand, three hundred seventy-one".