55871789 has 2 divisors, whose sum is σ = 55871790. Its totient is φ = 55871788.

The previous prime is 55871773. The next prime is 55871819. The reversal of 55871789 is 98717855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52809289 + 3062500 = 7267^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 55871789 - 2⁴ = 55871773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55871729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27935894 + 27935895.

It is an arithmetic number, because the mean of its divisors is an integer number (27935895).

Almost surely, 2^55871789 is an apocalyptic number.

It is an amenable number.

55871789 is a deficient number, since it is larger than the sum of its proper divisors (1).

55871789 is an equidigital number, since it uses as much as digits as its factorization.

55871789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 50.

The square root of 55871789 is about 7474.7434069672. The cubic root of 55871789 is about 382.2940386614.

The spelling of 55871789 in words is "fifty-five million, eight hundred seventy-one thousand, seven hundred eighty-nine".