55315609 has 2 divisors, whose sum is σ = 55315610. Its totient is φ = 55315608.

The previous prime is 55315597. The next prime is 55315613. The reversal of 55315609 is 90651355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 9455625 = 6772^2 + 3075^2 .

It is a cyclic number.

It is not a de Polignac number, because 55315609 - 2¹⁵ = 55282841 is a prime.

It is not a weakly prime, because it can be changed into another prime (55315619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27657804 + 27657805.

It is an arithmetic number, because the mean of its divisors is an integer number (27657805).

Almost surely, 2^55315609 is an apocalyptic number.

It is an amenable number.

55315609 is a deficient number, since it is larger than the sum of its proper divisors (1).

55315609 is an equidigital number, since it uses as much as digits as its factorization.

55315609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 55315609 is about 7437.4464031682. The cubic root of 55315609 is about 381.0212809280.

The spelling of 55315609 in words is "fifty-five million, three hundred fifteen thousand, six hundred nine".