55721503 has 2 divisors, whose sum is σ = 55721504. Its totient is φ = 55721502.

The previous prime is 55721483. The next prime is 55721537. The reversal of 55721503 is 30512755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55721503 - 2²⁵ = 22167071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55721803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27860751 + 27860752.

It is an arithmetic number, because the mean of its divisors is an integer number (27860752).

Almost surely, 2^55721503 is an apocalyptic number.

55721503 is a deficient number, since it is larger than the sum of its proper divisors (1).

55721503 is an equidigital number, since it uses as much as digits as its factorization.

55721503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 55721503 is about 7464.6837173453. The cubic root of 55721503 is about 381.9509613320.

The spelling of 55721503 in words is "fifty-five million, seven hundred twenty-one thousand, five hundred three".