55404491 has 2 divisors, whose sum is σ = 55404492. Its totient is φ = 55404490.

The previous prime is 55404473. The next prime is 55404497. The reversal of 55404491 is 19440455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55404491 - 2¹⁴ = 55388107 is a prime.

It is not a weakly prime, because it can be changed into another prime (55404497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27702245 + 27702246.

It is an arithmetic number, because the mean of its divisors is an integer number (27702246).

Almost surely, 2^55404491 is an apocalyptic number.

55404491 is a deficient number, since it is larger than the sum of its proper divisors (1).

55404491 is an equidigital number, since it uses as much as digits as its factorization.

55404491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 55404491 is about 7443.4193083555. The cubic root of 55404491 is about 381.2252487380.

The spelling of 55404491 in words is "fifty-five million, four hundred four thousand, four hundred ninety-one".