55422187 has 2 divisors, whose sum is σ = 55422188. Its totient is φ = 55422186.

The previous prime is 55422167. The next prime is 55422197. The reversal of 55422187 is 78122455.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55422187 is a prime.

It is not a weakly prime, because it can be changed into another prime (55422127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27711093 + 27711094.

It is an arithmetic number, because the mean of its divisors is an integer number (27711094).

Almost surely, 2^55422187 is an apocalyptic number.

55422187 is a deficient number, since it is larger than the sum of its proper divisors (1).

55422187 is an equidigital number, since it uses as much as digits as its factorization.

55422187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 34.

The square root of 55422187 is about 7444.6079144573. The cubic root of 55422187 is about 381.2658317532.

The spelling of 55422187 in words is "fifty-five million, four hundred twenty-two thousand, one hundred eighty-seven".