87018191 has 16 divisors (see below), whose sum is σ = 97049568. Its totient is φ = 77500800.

The previous prime is 87018179. The next prime is 87018199. The reversal of 87018191 is 19181078.

It is a de Polignac number, because none of the positive numbers 2^k-87018191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87018199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62321 + ... + 63701.

It is an arithmetic number, because the mean of its divisors is an integer number (6065598).

Almost surely, 2^87018191 is an apocalyptic number.

87018191 is a deficient number, since it is larger than the sum of its proper divisors (10031377).

87018191 is a wasteful number, since it uses less digits than its factorization.

87018191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 87018191 is about 9328.3541420767. The cubic root of 87018191 is about 443.1356432307.

The spelling of 87018191 in words is "eighty-seven million, eighteen thousand, one hundred ninety-one".