87125109 has 16 divisors (see below), whose sum is σ = 118173888. Its totient is φ = 57088512.

The previous prime is 87125083. The next prime is 87125131. The reversal of 87125109 is 90152178.

It is not a de Polignac number, because 87125109 - 2¹¹ = 87123061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87125109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87125179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44734 + ... + 46640.

It is an arithmetic number, because the mean of its divisors is an integer number (7385868).

Almost surely, 2^87125109 is an apocalyptic number.

It is an amenable number.

87125109 is a deficient number, since it is larger than the sum of its proper divisors (31048779).

87125109 is a wasteful number, since it uses less digits than its factorization.

87125109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 87125109 is about 9334.0831901157. The cubic root of 87125109 is about 443.3170604136.

The spelling of 87125109 in words is "eighty-seven million, one hundred twenty-five thousand, one hundred nine".