81017877 has 16 divisors (see below), whose sum is σ = 109767168. Its totient is φ = 53145840.

The previous prime is 81017863. The next prime is 81017917. The reversal of 81017877 is 77871018.

It is not a de Polignac number, because 81017877 - 2⁴ = 81017861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81017837) 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, 81928 + ... + 82910.

It is an arithmetic number, because the mean of its divisors is an integer number (6860448).

Almost surely, 2^81017877 is an apocalyptic number.

It is an amenable number.

81017877 is a deficient number, since it is larger than the sum of its proper divisors (28749291).

81017877 is a wasteful number, since it uses less digits than its factorization.

81017877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 21952, while the sum is 39.

The square root of 81017877 is about 9000.9931118738. The cubic root of 81017877 is about 432.7066997330.

The spelling of 81017877 in words is "eighty-one million, seventeen thousand, eight hundred seventy-seven".