55987187 has 2 divisors, whose sum is σ = 55987188. Its totient is φ = 55987186.

The previous prime is 55987163. The next prime is 55987201. The reversal of 55987187 is 78178955.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55987187 - 2²² = 51792883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55987117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27993593 + 27993594.

It is an arithmetic number, because the mean of its divisors is an integer number (27993594).

Almost surely, 2^55987187 is an apocalyptic number.

55987187 is a deficient number, since it is larger than the sum of its proper divisors (1).

55987187 is an equidigital number, since it uses as much as digits as its factorization.

55987187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 50.

The square root of 55987187 is about 7482.4586199992. The cubic root of 55987187 is about 382.5570552963.

The spelling of 55987187 in words is "fifty-five million, nine hundred eighty-seven thousand, one hundred eighty-seven".