87471181 has 12 divisors (see below), whose sum is σ = 103303776. Its totient is φ = 72551160.

The previous prime is 87471173. The next prime is 87471203. The reversal of 87471181 is 18117478.

It is not a de Polignac number, because 87471181 - 2³ = 87471173 is a prime.

It is a super-2 number, since 2×87471181² = 15302415011069522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87471181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87471101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226 + ... + 13228.

It is an arithmetic number, because the mean of its divisors is an integer number (8608648).

Almost surely, 2^87471181 is an apocalyptic number.

It is an amenable number.

87471181 is a deficient number, since it is larger than the sum of its proper divisors (15832595).

87471181 is a wasteful number, since it uses less digits than its factorization.

87471181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13072 (or 13041 counting only the distinct ones).

The product of its digits is 12544, while the sum is 37.

The square root of 87471181 is about 9352.6028997280. The cubic root of 87471181 is about 443.9032555090.

The spelling of 87471181 in words is "eighty-seven million, four hundred seventy-one thousand, one hundred eighty-one".