55222399 has 2 divisors, whose sum is σ = 55222400. Its totient is φ = 55222398.

The previous prime is 55222381. The next prime is 55222403. The reversal of 55222399 is 99322255.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55222399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55222339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27611199 + 27611200.

It is an arithmetic number, because the mean of its divisors is an integer number (27611200).

Almost surely, 2^55222399 is an apocalyptic number.

55222399 is a deficient number, since it is larger than the sum of its proper divisors (1).

55222399 is an equidigital number, since it uses as much as digits as its factorization.

55222399 is an evil number, because the sum of its binary digits is even.

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

The square root of 55222399 is about 7431.1774975437. The cubic root of 55222399 is about 380.8071463090.

It can be divided in two parts, 5522 and 2399, that added together give a square (7921 = 89²).

The spelling of 55222399 in words is "fifty-five million, two hundred twenty-two thousand, three hundred ninety-nine".