55489891 has 2 divisors, whose sum is σ = 55489892. Its totient is φ = 55489890.

The previous prime is 55489883. The next prime is 55489901. The reversal of 55489891 is 19898455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55489891 - 2³ = 55489883 is a prime.

It is not a weakly prime, because it can be changed into another prime (55489801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27744945 + 27744946.

It is an arithmetic number, because the mean of its divisors is an integer number (27744946).

Almost surely, 2^55489891 is an apocalyptic number.

55489891 is a deficient number, since it is larger than the sum of its proper divisors (1).

55489891 is an equidigital number, since it uses as much as digits as its factorization.

55489891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 49.

The square root of 55489891 is about 7449.1537103217. The cubic root of 55489891 is about 381.4210206118.

The spelling of 55489891 in words is "fifty-five million, four hundred eighty-nine thousand, eight hundred ninety-one".