55399369 has 2 divisors, whose sum is σ = 55399370. Its totient is φ = 55399368.

The previous prime is 55399349. The next prime is 55399373. The reversal of 55399369 is 96399355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44089600 + 11309769 = 6640^2 + 3363^2 .

It is a cyclic number.

It is not a de Polignac number, because 55399369 - 2⁹ = 55398857 is a prime.

It is a super-2 number, since 2×55399369² = 6138180171196322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55399349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27699684 + 27699685.

It is an arithmetic number, because the mean of its divisors is an integer number (27699685).

Almost surely, 2^55399369 is an apocalyptic number.

It is an amenable number.

55399369 is a deficient number, since it is larger than the sum of its proper divisors (1).

55399369 is an equidigital number, since it uses as much as digits as its factorization.

55399369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 984150, while the sum is 49.

The square root of 55399369 is about 7443.0752380988. The cubic root of 55399369 is about 381.2135006176.

It can be divided in two parts, 55 and 399369, that added together give a square (399424 = 632²).

The spelling of 55399369 in words is "fifty-five million, three hundred ninety-nine thousand, three hundred sixty-nine".