87012129 has 8 divisors (see below), whose sum is σ = 116116672. Its totient is φ = 57957840.

The previous prime is 87012113. The next prime is 87012139. The reversal of 87012129 is 92121078.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87012129 - 2⁴ = 87012113 is a prime.

It is a super-2 number, since 2×87012129² = 15142221186225282, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87012096 and 87012105.

It is not an unprimeable number, because it can be changed into a prime (87012139) 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, 8317 + ... + 15594.

It is an arithmetic number, because the mean of its divisors is an integer number (14514584).

Almost surely, 2^87012129 is an apocalyptic number.

It is an amenable number.

87012129 is a deficient number, since it is larger than the sum of its proper divisors (29104543).

87012129 is a wasteful number, since it uses less digits than its factorization.

87012129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25127.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 87012129 is about 9328.0292130760. The cubic root of 87012129 is about 443.1253528511.

The spelling of 87012129 in words is "eighty-seven million, twelve thousand, one hundred twenty-nine".