55869509 has 2 divisors, whose sum is σ = 55869510. Its totient is φ = 55869508.

The previous prime is 55869503. The next prime is 55869523. The reversal of 55869509 is 90596855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32376100 + 23493409 = 5690^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 55869509 - 2⁴ = 55869493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55869503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27934754 + 27934755.

It is an arithmetic number, because the mean of its divisors is an integer number (27934755).

Almost surely, 2^55869509 is an apocalyptic number.

It is an amenable number.

55869509 is a deficient number, since it is larger than the sum of its proper divisors (1).

55869509 is an equidigital number, since it uses as much as digits as its factorization.

55869509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486000, while the sum is 47.

The square root of 55869509 is about 7474.5908918147. The cubic root of 55869509 is about 382.2888384087.

The spelling of 55869509 in words is "fifty-five million, eight hundred sixty-nine thousand, five hundred nine".