81080157 has 16 divisors (see below), whose sum is σ = 115758720. Its totient is φ = 50299392.

The previous prime is 81080141. The next prime is 81080171. The reversal of 81080157 is 75108018.

It is not a de Polignac number, because 81080157 - 2⁴ = 81080141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4393 + ... + 13470.

It is an arithmetic number, because the mean of its divisors is an integer number (7234920).

Almost surely, 2^81080157 is an apocalyptic number.

It is an amenable number.

81080157 is a deficient number, since it is larger than the sum of its proper divisors (34678563).

81080157 is a wasteful number, since it uses less digits than its factorization.

81080157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17972.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 81080157 is about 9004.4520655063. The cubic root of 81080157 is about 432.8175479877.

The spelling of 81080157 in words is "eighty-one million, eighty thousand, one hundred fifty-seven".