81589021233 has 8 divisors (see below), whose sum is σ = 108957765696. Its totient is φ = 54306478800.

The previous prime is 81589021193. The next prime is 81589021291. The reversal of 81589021233 is 33212098518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81589021233 - 2⁶ = 81589021169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81589421233) 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, 21548298 + ... + 21552083.

It is an arithmetic number, because the mean of its divisors is an integer number (13619720712).

Almost surely, 2^81589021233 is an apocalyptic number.

It is an amenable number.

81589021233 is a deficient number, since it is larger than the sum of its proper divisors (27368744463).

81589021233 is a wasteful number, since it uses less digits than its factorization.

81589021233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43101015.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 81589021233 in words is "eighty-one billion, five hundred eighty-nine million, twenty-one thousand, two hundred thirty-three".