55042399 has 2 divisors, whose sum is σ = 55042400. Its totient is φ = 55042398.

The previous prime is 55042397. The next prime is 55042423. The reversal of 55042399 is 99324055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55042399 - 2¹ = 55042397 is a prime.

Together with 55042397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55042397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27521199 + 27521200.

It is an arithmetic number, because the mean of its divisors is an integer number (27521200).

Almost surely, 2^55042399 is an apocalyptic number.

55042399 is a deficient number, since it is larger than the sum of its proper divisors (1).

55042399 is an equidigital number, since it uses as much as digits as its factorization.

55042399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 55042399 is about 7419.0564763991. The cubic root of 55042399 is about 380.3929430252.

The spelling of 55042399 in words is "fifty-five million, forty-two thousand, three hundred ninety-nine".