55804409 has 2 divisors, whose sum is σ = 55804410. Its totient is φ = 55804408.

The previous prime is 55804379. The next prime is 55804429. The reversal of 55804409 is 90440855.

55804409 is nontrivially palindromic in base 13.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54804409 + 1000000 = 7403^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 55804409 - 2¹² = 55800313 is a prime.

It is a super-2 number, since 2×55804409² = 6228264127678562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55804429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27902204 + 27902205.

It is an arithmetic number, because the mean of its divisors is an integer number (27902205).

Almost surely, 2^55804409 is an apocalyptic number.

It is an amenable number.

55804409 is a deficient number, since it is larger than the sum of its proper divisors (1).

55804409 is an equidigital number, since it uses as much as digits as its factorization.

55804409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 55804409 is about 7470.2348691323. The cubic root of 55804409 is about 382.1402977805.

The spelling of 55804409 in words is "fifty-five million, eight hundred four thousand, four hundred nine".