87551691 has 8 divisors (see below), whose sum is σ = 117381264. Its totient is φ = 58044960.

The previous prime is 87551689. The next prime is 87551713. The reversal of 87551691 is 19615578.

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

It is not a de Polignac number, because 87551691 - 2¹ = 87551689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87555691) 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, 80076 + ... + 81161.

It is an arithmetic number, because the mean of its divisors is an integer number (14672658).

Almost surely, 2^87551691 is an apocalyptic number.

87551691 is a deficient number, since it is larger than the sum of its proper divisors (29829573).

87551691 is a wasteful number, since it uses less digits than its factorization.

87551691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161421.

The product of its digits is 75600, while the sum is 42.

The square root of 87551691 is about 9356.9060591629. The cubic root of 87551691 is about 444.0394058443.

The spelling of 87551691 in words is "eighty-seven million, five hundred fifty-one thousand, six hundred ninety-one".