55861199 has 2 divisors, whose sum is σ = 55861200. Its totient is φ = 55861198.

The previous prime is 55861187. The next prime is 55861207. The reversal of 55861199 is 99116855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55861199 - 2²⁴ = 39083983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55861109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27930599 + 27930600.

It is an arithmetic number, because the mean of its divisors is an integer number (27930600).

Almost surely, 2^55861199 is an apocalyptic number.

55861199 is a deficient number, since it is larger than the sum of its proper divisors (1).

55861199 is an equidigital number, since it uses as much as digits as its factorization.

55861199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 44.

The square root of 55861199 is about 7474.0349878764. The cubic root of 55861199 is about 382.2698836584.

The spelling of 55861199 in words is "fifty-five million, eight hundred sixty-one thousand, one hundred ninety-nine".