55391299 has 2 divisors, whose sum is σ = 55391300. Its totient is φ = 55391298.

The previous prime is 55391269. The next prime is 55391309. The reversal of 55391299 is 99219355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55391299 - 2⁹ = 55390787 is a prime.

It is not a weakly prime, because it can be changed into another prime (55391269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27695649 + 27695650.

It is an arithmetic number, because the mean of its divisors is an integer number (27695650).

Almost surely, 2^55391299 is an apocalyptic number.

55391299 is a deficient number, since it is larger than the sum of its proper divisors (1).

55391299 is an equidigital number, since it uses as much as digits as its factorization.

55391299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109350, while the sum is 43.

The square root of 55391299 is about 7442.5331037221. The cubic root of 55391299 is about 381.1949893217.

The spelling of 55391299 in words is "fifty-five million, three hundred ninety-one thousand, two hundred ninety-nine".