81651153 has 16 divisors (see below), whose sum is σ = 119249280. Its totient is φ = 49464576.

The previous prime is 81651133. The next prime is 81651169. The reversal of 81651153 is 35115618.

It is not a de Polignac number, because 81651153 - 2²² = 77456849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81651153.

It is not an unprimeable number, because it can be changed into a prime (81651133) 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, 26125 + ... + 29082.

It is an arithmetic number, because the mean of its divisors is an integer number (7453080).

Almost surely, 2^81651153 is an apocalyptic number.

It is an amenable number.

81651153 is a deficient number, since it is larger than the sum of its proper divisors (37598127).

81651153 is a wasteful number, since it uses less digits than its factorization.

81651153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55256.

The product of its digits is 3600, while the sum is 30.

The square root of 81651153 is about 9036.1027550598. The cubic root of 81651153 is about 433.8311918260.

The spelling of 81651153 in words is "eighty-one million, six hundred fifty-one thousand, one hundred fifty-three".