55021751 has 2 divisors, whose sum is σ = 55021752. Its totient is φ = 55021750.

The previous prime is 55021723. The next prime is 55021763. The reversal of 55021751 is 15712055.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55021751 - 2¹⁰ = 55020727 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55021751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55021711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27510875 + 27510876.

It is an arithmetic number, because the mean of its divisors is an integer number (27510876).

Almost surely, 2^55021751 is an apocalyptic number.

55021751 is a deficient number, since it is larger than the sum of its proper divisors (1).

55021751 is an equidigital number, since it uses as much as digits as its factorization.

55021751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 55021751 is about 7417.6647942597. The cubic root of 55021751 is about 380.3453716017.

The spelling of 55021751 in words is "fifty-five million, twenty-one thousand, seven hundred fifty-one".