82992181 has 8 divisors (see below), whose sum is σ = 88003800. Its totient is φ = 77995008.

The previous prime is 82992179. The next prime is 82992191. The reversal of 82992181 is 18129928.

It can be written as a sum of positive squares in 4 ways, for example, as 51351556 + 31640625 = 7166^2 + 5625^2 .

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 82992181 - 2¹ = 82992179 is a prime.

It is a super-2 number, since 2×82992181² = 13775404214273522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82992131) 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, 9645 + ... + 16093.

It is an arithmetic number, because the mean of its divisors is an integer number (11000475).

Almost surely, 2^82992181 is an apocalyptic number.

It is an amenable number.

82992181 is a deficient number, since it is larger than the sum of its proper divisors (5011619).

82992181 is a wasteful number, since it uses less digits than its factorization.

82992181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223.

The product of its digits is 20736, while the sum is 40.

The square root of 82992181 is about 9110.0044456630. The cubic root of 82992181 is about 436.1933691127.

It can be divided in two parts, 829921 and 81, that multiplied together give a square (67223601 = 8199²).

The spelling of 82992181 in words is "eighty-two million, nine hundred ninety-two thousand, one hundred eighty-one".