81113763 has 16 divisors (see below), whose sum is σ = 111891456. Its totient is φ = 52213920.

The previous prime is 81113761. The next prime is 81113771. The reversal of 81113763 is 36731118.

It is not a de Polignac number, because 81113763 - 2¹ = 81113761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81113763.

It is not an unprimeable number, because it can be changed into a prime (81113761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62881 + ... + 64157.

It is an arithmetic number, because the mean of its divisors is an integer number (6993216).

Almost surely, 2^81113763 is an apocalyptic number.

81113763 is a deficient number, since it is larger than the sum of its proper divisors (30777693).

81113763 is a wasteful number, since it uses less digits than its factorization.

81113763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994.

The product of its digits is 3024, while the sum is 30.

The square root of 81113763 is about 9006.3179490844. The cubic root of 81113763 is about 432.8773376163.

The spelling of 81113763 in words is "eighty-one million, one hundred thirteen thousand, seven hundred sixty-three".