87555551 has 4 divisors (see below), whose sum is σ = 87577152. Its totient is φ = 87533952.

The previous prime is 87555547. The next prime is 87555569. The reversal of 87555551 is 15555578.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87555551 - 2² = 87555547 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 87555499 and 87555508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87555511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (21894288).

Almost surely, 2^87555551 is an apocalyptic number.

87555551 is a deficient number, since it is larger than the sum of its proper divisors (21601).

87555551 is a wasteful number, since it uses less digits than its factorization.

87555551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21600.

The product of its digits is 175000, while the sum is 41.

The square root of 87555551 is about 9357.1123216514. The cubic root of 87555551 is about 444.0459313871.

The spelling of 87555551 in words is "eighty-seven million, five hundred fifty-five thousand, five hundred fifty-one".