81560233 has 8 divisors (see below), whose sum is σ = 83137536. Its totient is φ = 79990800.

The previous prime is 81560201. The next prime is 81560249. The reversal of 81560233 is 33206518.

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 81560233 - 2⁵ = 81560201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81560273) 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, 21618 + ... + 25108.

It is an arithmetic number, because the mean of its divisors is an integer number (10392192).

Almost surely, 2^81560233 is an apocalyptic number.

It is an amenable number.

81560233 is a deficient number, since it is larger than the sum of its proper divisors (1577303).

81560233 is a wasteful number, since it uses less digits than its factorization.

81560233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 81560233 is about 9031.0704238202. The cubic root of 81560233 is about 433.6701057908.

The spelling of 81560233 in words is "eighty-one million, five hundred sixty thousand, two hundred thirty-three".