55122909 has 16 divisors (see below), whose sum is σ = 75116160. Its totient is φ = 35947520.

The previous prime is 55122877. The next prime is 55122913. The reversal of 55122909 is 90922155.

55122909 = 305² + 306² + ... + 578².

It is a cyclic number.

It is not a de Polignac number, because 55122909 - 2⁵ = 55122877 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55122909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55122919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28237 + ... + 30125.

It is an arithmetic number, because the mean of its divisors is an integer number (4694760).

Almost surely, 2^55122909 is an apocalyptic number.

It is an amenable number.

55122909 is a deficient number, since it is larger than the sum of its proper divisors (19993251).

55122909 is a wasteful number, since it uses less digits than its factorization.

55122909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 55122909 is about 7424.4803858587. The cubic root of 55122909 is about 380.5783184005.

The spelling of 55122909 in words is "fifty-five million, one hundred twenty-two thousand, nine hundred nine".