55297909 has 2 divisors, whose sum is σ = 55297910. Its totient is φ = 55297908.

The previous prime is 55297901. The next prime is 55297939. The reversal of 55297909 is 90979255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40259025 + 15038884 = 6345^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 55297909 - 2³ = 55297901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55297901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27648954 + 27648955.

It is an arithmetic number, because the mean of its divisors is an integer number (27648955).

Almost surely, 2^55297909 is an apocalyptic number.

It is an amenable number.

55297909 is a deficient number, since it is larger than the sum of its proper divisors (1).

55297909 is an equidigital number, since it uses as much as digits as its factorization.

55297909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 255150, while the sum is 46.

The square root of 55297909 is about 7436.2563834230. The cubic root of 55297909 is about 380.9806366068.

The spelling of 55297909 in words is "fifty-five million, two hundred ninety-seven thousand, nine hundred nine".