87505651 has 4 divisors (see below), whose sum is σ = 87531304. Its totient is φ = 87480000.

The previous prime is 87505633. The next prime is 87505657. The reversal of 87505651 is 15650578.

It is a semiprime because it is the product of two primes.

It is a 6-Lehmer number, since φ(87505651) divides (87505651-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 87505651 - 2¹⁷ = 87374579 is a prime.

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 87505651.

It is not an unprimeable number, because it can be changed into a prime (87505657) 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 3 ways as a sum of consecutive naturals, for example, 6750 + ... + 14851.

It is an arithmetic number, because the mean of its divisors is an integer number (21882826).

Almost surely, 2^87505651 is an apocalyptic number.

87505651 is a deficient number, since it is larger than the sum of its proper divisors (25653).

87505651 is a wasteful number, since it uses less digits than its factorization.

87505651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25652.

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 87505651 is about 9354.4455207137. The cubic root of 87505651 is about 443.9615578951.

The spelling of 87505651 in words is "eighty-seven million, five hundred five thousand, six hundred fifty-one".