55721473 has 2 divisors, whose sum is σ = 55721474. Its totient is φ = 55721472.

The previous prime is 55721459. The next prime is 55721483. The reversal of 55721473 is 37412755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54656449 + 1065024 = 7393^2 + 1032^2 .

It is a cyclic number.

It is not a de Polignac number, because 55721473 - 2⁹ = 55720961 is a prime.

It is not a weakly prime, because it can be changed into another prime (55721423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27860736 + 27860737.

It is an arithmetic number, because the mean of its divisors is an integer number (27860737).

Almost surely, 2^55721473 is an apocalyptic number.

It is an amenable number.

55721473 is a deficient number, since it is larger than the sum of its proper divisors (1).

55721473 is an equidigital number, since it uses as much as digits as its factorization.

55721473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 34.

The square root of 55721473 is about 7464.6817078828. The cubic root of 55721473 is about 381.9508927856.

The spelling of 55721473 in words is "fifty-five million, seven hundred twenty-one thousand, four hundred seventy-three".