55252409 has 2 divisors, whose sum is σ = 55252410. Its totient is φ = 55252408.

The previous prime is 55252403. The next prime is 55252411. The reversal of 55252409 is 90425255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32718400 + 22534009 = 5720^2 + 4747^2 .

It is a cyclic number.

It is not a de Polignac number, because 55252409 - 2²⁰ = 54203833 is a prime.

Together with 55252411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55252403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27626204 + 27626205.

It is an arithmetic number, because the mean of its divisors is an integer number (27626205).

Almost surely, 2^55252409 is an apocalyptic number.

It is an amenable number.

55252409 is a deficient number, since it is larger than the sum of its proper divisors (1).

55252409 is an equidigital number, since it uses as much as digits as its factorization.

55252409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 55252409 is about 7433.1964187690. The cubic root of 55252409 is about 380.8761156231.

The spelling of 55252409 in words is "fifty-five million, two hundred fifty-two thousand, four hundred nine".