56122909 has 2 divisors, whose sum is σ = 56122910. Its totient is φ = 56122908.

The previous prime is 56122907. The next prime is 56122931. The reversal of 56122909 is 90922165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43520409 + 12602500 = 6597^2 + 3550^2 .

It is a cyclic number.

It is not a de Polignac number, because 56122909 - 2¹ = 56122907 is a prime.

Together with 56122907, 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 (56122907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28061454 + 28061455.

It is an arithmetic number, because the mean of its divisors is an integer number (28061455).

Almost surely, 2^56122909 is an apocalyptic number.

It is an amenable number.

56122909 is a deficient number, since it is larger than the sum of its proper divisors (1).

56122909 is an equidigital number, since it uses as much as digits as its factorization.

56122909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 56122909 is about 7491.5224754385. The cubic root of 56122909 is about 382.8659325744.

The spelling of 56122909 in words is "fifty-six million, one hundred twenty-two thousand, nine hundred nine".