81907055 has 8 divisors (see below), whose sum is σ = 98538432. Its totient is φ = 65359008.

The previous prime is 81907051. The next prime is 81907093. The reversal of 81907055 is 55070918.

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 81907055 - 2² = 81907051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81907051) 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, 18647 + ... + 22616.

It is an arithmetic number, because the mean of its divisors is an integer number (12317304).

Almost surely, 2^81907055 is an apocalyptic number.

81907055 is a deficient number, since it is larger than the sum of its proper divisors (16631377).

81907055 is a wasteful number, since it uses less digits than its factorization.

81907055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41665.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 81907055 is about 9050.2516539597. The cubic root of 81907055 is about 434.2839410594.

The spelling of 81907055 in words is "eighty-one million, nine hundred seven thousand, fifty-five".