55998109 has 2 divisors, whose sum is σ = 55998110. Its totient is φ = 55998108.

The previous prime is 55998079. The next prime is 55998193. The reversal of 55998109 is 90189955.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55086084 + 912025 = 7422^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 55998109 - 2¹⁵ = 55965341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55998209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27999054 + 27999055.

It is an arithmetic number, because the mean of its divisors is an integer number (27999055).

Almost surely, 2^55998109 is an apocalyptic number.

It is an amenable number.

55998109 is a deficient number, since it is larger than the sum of its proper divisors (1).

55998109 is an equidigital number, since it uses as much as digits as its factorization.

55998109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 55998109 is about 7483.1884247291. The cubic root of 55998109 is about 382.5819301335.

The spelling of 55998109 in words is "fifty-five million, nine hundred ninety-eight thousand, one hundred nine".