82188891 has 8 divisors (see below), whose sum is σ = 121761360. Its totient is φ = 54792576.

The previous prime is 82188881. The next prime is 82188901. The reversal of 82188891 is 19888128.

It is an interprime number because it is at equal distance from previous prime (82188881) and next prime (82188901).

It is not a de Polignac number, because 82188891 - 2¹⁴ = 82172507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82188811) 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, 1521990 + ... + 1522043.

It is an arithmetic number, because the mean of its divisors is an integer number (15220170).

Almost surely, 2^82188891 is an apocalyptic number.

82188891 is a deficient number, since it is larger than the sum of its proper divisors (39572469).

82188891 is a wasteful number, since it uses less digits than its factorization.

82188891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044042 (or 3044036 counting only the distinct ones).

The product of its digits is 73728, while the sum is 45.

The square root of 82188891 is about 9065.8088993757. The cubic root of 82188891 is about 434.7814835909.

The spelling of 82188891 in words is "eighty-two million, one hundred eighty-eight thousand, eight hundred ninety-one".