81898695 has 20 divisors (see below), whose sum is σ = 146811720. Its totient is φ = 43679088.

The previous prime is 81898693. The next prime is 81898777. The reversal of 81898695 is 59689818.

It is not a de Polignac number, because 81898695 - 2¹ = 81898693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81898693) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 100705 + ... + 101514.

It is an arithmetic number, because the mean of its divisors is an integer number (7340586).

Almost surely, 2^81898695 is an apocalyptic number.

81898695 is a deficient number, since it is larger than the sum of its proper divisors (64913025).

81898695 is a wasteful number, since it uses less digits than its factorization.

81898695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202236 (or 202227 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 81898695 is about 9049.7897765639. The cubic root of 81898695 is about 434.2691652168.

The spelling of 81898695 in words is "eighty-one million, eight hundred ninety-eight thousand, six hundred ninety-five".