180491085 has 20 divisors (see below), whose sum is σ = 323547708. Its totient is φ = 96261696.

The previous prime is 180491033. The next prime is 180491111. The reversal of 180491085 is 580194081.

It can be written as a sum of positive squares in 2 ways, for example, as 128391561 + 52099524 = 11331^2 + 7218^2 .

It is not a de Polignac number, because 180491085 - 2⁷ = 180490957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 222424 + ... + 223233.

Almost surely, 2^180491085 is an apocalyptic number.

180491085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

180491085 is a deficient number, since it is larger than the sum of its proper divisors (143056623).

180491085 is an equidigital number, since it uses as much as digits as its factorization.

180491085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445674 (or 445665 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 180491085 is about 13434.6970565026. The cubic root of 180491085 is about 565.1346273804.

The spelling of 180491085 in words is "one hundred eighty million, four hundred ninety-one thousand, eighty-five".