55871549 has 2 divisors, whose sum is σ = 55871550. Its totient is φ = 55871548.

The previous prime is 55871509. The next prime is 55871551. The reversal of 55871549 is 94517855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37295449 + 18576100 = 6107^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 55871549 - 2²⁴ = 39094333 is a prime.

Together with 55871551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55871509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27935774 + 27935775.

It is an arithmetic number, because the mean of its divisors is an integer number (27935775).

Almost surely, 2^55871549 is an apocalyptic number.

It is an amenable number.

55871549 is a deficient number, since it is larger than the sum of its proper divisors (1).

55871549 is an equidigital number, since it uses as much as digits as its factorization.

55871549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 44.

The square root of 55871549 is about 7474.7273528872. The cubic root of 55871549 is about 382.2934912730.

The spelling of 55871549 in words is "fifty-five million, eight hundred seventy-one thousand, five hundred forty-nine".