55921133 has 2 divisors, whose sum is σ = 55921134. Its totient is φ = 55921132.

The previous prime is 55921093. The next prime is 55921147. The reversal of 55921133 is 33112955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46199209 + 9721924 = 6797^2 + 3118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55921133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55921096 and 55921105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55921163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27960566 + 27960567.

It is an arithmetic number, because the mean of its divisors is an integer number (27960567).

Almost surely, 2^55921133 is an apocalyptic number.

It is an amenable number.

55921133 is a deficient number, since it is larger than the sum of its proper divisors (1).

55921133 is an equidigital number, since it uses as much as digits as its factorization.

55921133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 29.

The square root of 55921133 is about 7478.0433938297. The cubic root of 55921133 is about 382.4065484317.

The spelling of 55921133 in words is "fifty-five million, nine hundred twenty-one thousand, one hundred thirty-three".