87555421 has 4 divisors (see below), whose sum is σ = 87574144. Its totient is φ = 87536700.

The previous prime is 87555383. The next prime is 87555487. The reversal of 87555421 is 12455578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 87555421 - 2¹¹ = 87553373 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87555121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4276 + ... + 13906.

It is an arithmetic number, because the mean of its divisors is an integer number (21893536).

Almost surely, 2^87555421 is an apocalyptic number.

It is an amenable number.

87555421 is a deficient number, since it is larger than the sum of its proper divisors (18723).

87555421 is an equidigital number, since it uses as much as digits as its factorization.

87555421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18722.

The product of its digits is 56000, while the sum is 37.

The square root of 87555421 is about 9357.1053750612. The cubic root of 87555421 is about 444.0457116181.

The spelling of 87555421 in words is "eighty-seven million, five hundred fifty-five thousand, four hundred twenty-one".