81113633 has 8 divisors (see below), whose sum is σ = 82225728. Its totient is φ = 80007984.

The previous prime is 81113629. The next prime is 81113651. The reversal of 81113633 is 33631118.

It is a happy number.

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 81113633 - 2² = 81113629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81113623) 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, 27110 + ... + 29952.

It is an arithmetic number, because the mean of its divisors is an integer number (10278216).

Almost surely, 2^81113633 is an apocalyptic number.

It is an amenable number.

81113633 is a deficient number, since it is larger than the sum of its proper divisors (1112095).

81113633 is a wasteful number, since it uses less digits than its factorization.

81113633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223.

The product of its digits is 1296, while the sum is 26.

The square root of 81113633 is about 9006.3107319257. The cubic root of 81113633 is about 432.8771063605.

The spelling of 81113633 in words is "eighty-one million, one hundred thirteen thousand, six hundred thirty-three".