55399933 has 2 divisors, whose sum is σ = 55399934. Its totient is φ = 55399932.

The previous prime is 55399921. The next prime is 55399943. The reversal of 55399933 is 33999355.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46744569 + 8655364 = 6837^2 + 2942^2 .

It is a cyclic number.

It is not a de Polignac number, because 55399933 - 2¹³ = 55391741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55399943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27699966 + 27699967.

It is an arithmetic number, because the mean of its divisors is an integer number (27699967).

Almost surely, 2^55399933 is an apocalyptic number.

It is an amenable number.

55399933 is a deficient number, since it is larger than the sum of its proper divisors (1).

55399933 is an equidigital number, since it uses as much as digits as its factorization.

55399933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 492075, while the sum is 46.

The square root of 55399933 is about 7443.1131255678. The cubic root of 55399933 is about 381.2147942766.

The spelling of 55399933 in words is "fifty-five million, three hundred ninety-nine thousand, nine hundred thirty-three".