55418009 has 2 divisors, whose sum is σ = 55418010. Its totient is φ = 55418008.

The previous prime is 55417997. The next prime is 55418053. The reversal of 55418009 is 90081455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44262409 + 11155600 = 6653^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 55418009 - 2¹² = 55413913 is a prime.

It is not a weakly prime, because it can be changed into another prime (55418089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27709004 + 27709005.

It is an arithmetic number, because the mean of its divisors is an integer number (27709005).

Almost surely, 2^55418009 is an apocalyptic number.

It is an amenable number.

55418009 is a deficient number, since it is larger than the sum of its proper divisors (1).

55418009 is an equidigital number, since it uses as much as digits as its factorization.

55418009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 55418009 is about 7444.3273033901. The cubic root of 55418009 is about 381.2562509411.

The spelling of 55418009 in words is "fifty-five million, four hundred eighteen thousand, nine".