55420109 has 2 divisors, whose sum is σ = 55420110. Its totient is φ = 55420108.

The previous prime is 55420063. The next prime is 55420111. The reversal of 55420109 is 90102455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37332100 + 18088009 = 6110^2 + 4253^2 .

It is a cyclic number.

It is not a de Polignac number, because 55420109 - 2²⁴ = 38642893 is a prime.

Together with 55420111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55420129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710054 + 27710055.

It is an arithmetic number, because the mean of its divisors is an integer number (27710055).

Almost surely, 2^55420109 is an apocalyptic number.

It is an amenable number.

55420109 is a deficient number, since it is larger than the sum of its proper divisors (1).

55420109 is an equidigital number, since it uses as much as digits as its factorization.

55420109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 55420109 is about 7444.4683490495. The cubic root of 55420109 is about 381.2610666321.

The spelling of 55420109 in words is "fifty-five million, four hundred twenty thousand, one hundred nine".