55222187 has 2 divisors, whose sum is σ = 55222188. Its totient is φ = 55222186.

The previous prime is 55222183. The next prime is 55222199. The reversal of 55222187 is 78122255.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55222187 - 2² = 55222183 is a prime.

It is not a weakly prime, because it can be changed into another prime (55222183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27611093 + 27611094.

It is an arithmetic number, because the mean of its divisors is an integer number (27611094).

Almost surely, 2^55222187 is an apocalyptic number.

55222187 is a deficient number, since it is larger than the sum of its proper divisors (1).

55222187 is an equidigital number, since it uses as much as digits as its factorization.

55222187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11200, while the sum is 32.

The square root of 55222187 is about 7431.1632333034. The cubic root of 55222187 is about 380.8066589994.

The spelling of 55222187 in words is "fifty-five million, two hundred twenty-two thousand, one hundred eighty-seven".