55709569 has 2 divisors, whose sum is σ = 55709570. Its totient is φ = 55709568.

The previous prime is 55709567. The next prime is 55709581. The reversal of 55709569 is 96590755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52751169 + 2958400 = 7263^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 55709569 - 2¹ = 55709567 is a prime.

It is a super-2 number, since 2×55709569² = 6207112156331522, which contains 22 as substring.

Together with 55709567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55709567) 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, 27854784 + 27854785.

It is an arithmetic number, because the mean of its divisors is an integer number (27854785).

Almost surely, 2^55709569 is an apocalyptic number.

It is an amenable number.

55709569 is a deficient number, since it is larger than the sum of its proper divisors (1).

55709569 is an equidigital number, since it uses as much as digits as its factorization.

55709569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 425250, while the sum is 46.

The square root of 55709569 is about 7463.8843104646. The cubic root of 55709569 is about 381.9236916187.

The spelling of 55709569 in words is "fifty-five million, seven hundred nine thousand, five hundred sixty-nine".