87919925181 has 16 divisors (see below), whose sum is σ = 129424296960. Its totient is φ = 52642815920.

The previous prime is 87919925173. The next prime is 87919925213. The reversal of 87919925181 is 18152991978.

It is a cyclic number.

It is not a de Polignac number, because 87919925181 - 2³ = 87919925173 is a prime.

It is a super-2 number, since 2×87919925181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87919945181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16046901 + ... + 16052378.

It is an arithmetic number, because the mean of its divisors is an integer number (8089018560).

Almost surely, 2^87919925181 is an apocalyptic number.

It is an amenable number.

87919925181 is a deficient number, since it is larger than the sum of its proper divisors (41504371779).

87919925181 is a wasteful number, since it uses less digits than its factorization.

87919925181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32099376.

The product of its digits is 3265920, while the sum is 60.

The spelling of 87919925181 in words is "eighty-seven billion, nine hundred nineteen million, nine hundred twenty-five thousand, one hundred eighty-one".