55790509 has 2 divisors, whose sum is σ = 55790510. Its totient is φ = 55790508.

The previous prime is 55790507. The next prime is 55790513. The reversal of 55790509 is 90509755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54834025 + 956484 = 7405^2 + 978^2 .

It is a cyclic number.

It is not a de Polignac number, because 55790509 - 2¹ = 55790507 is a prime.

It is a super-2 number, since 2×55790509² = 6225161788958162, which contains 22 as substring.

Together with 55790507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55790507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27895254 + 27895255.

It is an arithmetic number, because the mean of its divisors is an integer number (27895255).

Almost surely, 2^55790509 is an apocalyptic number.

It is an amenable number.

55790509 is a deficient number, since it is larger than the sum of its proper divisors (1).

55790509 is an equidigital number, since it uses as much as digits as its factorization.

55790509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70875, while the sum is 40.

The square root of 55790509 is about 7469.3044522231. The cubic root of 55790509 is about 382.1085667679.

The spelling of 55790509 in words is "fifty-five million, seven hundred ninety thousand, five hundred nine".