55549409 has 2 divisors, whose sum is σ = 55549410. Its totient is φ = 55549408.

The previous prime is 55549391. The next prime is 55549411. The reversal of 55549409 is 90494555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 5987809 = 7040^2 + 2447^2 .

It is a cyclic number.

It is not a de Polignac number, because 55549409 - 2²⁴ = 38772193 is a prime.

Together with 55549411, 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 (55549009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27774704 + 27774705.

It is an arithmetic number, because the mean of its divisors is an integer number (27774705).

Almost surely, 2^55549409 is an apocalyptic number.

It is an amenable number.

55549409 is a deficient number, since it is larger than the sum of its proper divisors (1).

55549409 is an equidigital number, since it uses as much as digits as its factorization.

55549409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 55549409 is about 7453.1475901125. The cubic root of 55549409 is about 381.5573415661.

The spelling of 55549409 in words is "fifty-five million, five hundred forty-nine thousand, four hundred nine".