55681889 has 2 divisors, whose sum is σ = 55681890. Its totient is φ = 55681888.

The previous prime is 55681883. The next prime is 55681897. The reversal of 55681889 is 98818655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46348864 + 9333025 = 6808^2 + 3055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55681889 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55681883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27840944 + 27840945.

It is an arithmetic number, because the mean of its divisors is an integer number (27840945).

Almost surely, 2^55681889 is an apocalyptic number.

It is an amenable number.

55681889 is a deficient number, since it is larger than the sum of its proper divisors (1).

55681889 is an equidigital number, since it uses as much as digits as its factorization.

55681889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 50.

The square root of 55681889 is about 7462.0298176837. The cubic root of 55681889 is about 381.8604266097.

The spelling of 55681889 in words is "fifty-five million, six hundred eighty-one thousand, eight hundred eighty-nine".