81180187 has 8 divisors (see below), whose sum is σ = 88657920. Its totient is φ = 73718760.

The previous prime is 81180181. The next prime is 81180221. The reversal of 81180187 is 78108118.

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 81180187 - 2¹⁵ = 81147419 is a prime.

It is a super-2 number, since 2×81180187² = 13180445522709938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81180181) 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, 7878 + ... + 14980.

It is an arithmetic number, because the mean of its divisors is an integer number (11082240).

Almost surely, 2^81180187 is an apocalyptic number.

81180187 is a deficient number, since it is larger than the sum of its proper divisors (7477733).

81180187 is a wasteful number, since it uses less digits than its factorization.

81180187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8153.

The product of its (nonzero) digits is 3584, while the sum is 34.

The square root of 81180187 is about 9010.0048279676. The cubic root of 81180187 is about 432.9954663532.

The spelling of 81180187 in words is "eighty-one million, one hundred eighty thousand, one hundred eighty-seven".