55415909 has 2 divisors, whose sum is σ = 55415910. Its totient is φ = 55415908.

The previous prime is 55415881. The next prime is 55415911. The reversal of 55415909 is 90951455.

55415909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31922500 + 23493409 = 5650^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 55415909 - 2¹² = 55411813 is a prime.

Together with 55415911, 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 (55415929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27707954 + 27707955.

It is an arithmetic number, because the mean of its divisors is an integer number (27707955).

Almost surely, 2^55415909 is an apocalyptic number.

It is an amenable number.

55415909 is a deficient number, since it is larger than the sum of its proper divisors (1).

55415909 is an equidigital number, since it uses as much as digits as its factorization.

55415909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 55415909 is about 7444.1862550584. The cubic root of 55415909 is about 381.2514351285.

The spelling of 55415909 in words is "fifty-five million, four hundred fifteen thousand, nine hundred nine".