81859233 has 8 divisors (see below), whose sum is σ = 115566048. Its totient is φ = 51362624.

The previous prime is 81859181. The next prime is 81859291. The reversal of 81859233 is 33295818.

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 81859233 - 2²⁰ = 80810657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81859191 and 81859200.

It is not an unprimeable number, because it can be changed into a prime (81859033) 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, 802491 + ... + 802592.

It is an arithmetic number, because the mean of its divisors is an integer number (14445756).

Almost surely, 2^81859233 is an apocalyptic number.

It is an amenable number.

81859233 is a deficient number, since it is larger than the sum of its proper divisors (33706815).

81859233 is a wasteful number, since it uses less digits than its factorization.

81859233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605103.

The product of its digits is 51840, while the sum is 39.

The square root of 81859233 is about 9047.6092422253. The cubic root of 81859233 is about 434.1994047117.

The spelling of 81859233 in words is "eighty-one million, eight hundred fifty-nine thousand, two hundred thirty-three".