55604009 has 2 divisors, whose sum is σ = 55604010. Its totient is φ = 55604008.

The previous prime is 55603997. The next prime is 55604011. The reversal of 55604009 is 90040655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 1507984 = 7355^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 55604009 - 2⁴ = 55603993 is a prime.

Together with 55604011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55604099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27802004 + 27802005.

It is an arithmetic number, because the mean of its divisors is an integer number (27802005).

Almost surely, 2^55604009 is an apocalyptic number.

It is an amenable number.

55604009 is a deficient number, since it is larger than the sum of its proper divisors (1).

55604009 is an equidigital number, since it uses as much as digits as its factorization.

55604009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 55604009 is about 7456.8095724646. The cubic root of 55604009 is about 381.6823126461.

The spelling of 55604009 in words is "fifty-five million, six hundred four thousand, nine".