54989861 has 2 divisors, whose sum is σ = 54989862. Its totient is φ = 54989860.

The previous prime is 54989813. The next prime is 54989863. The reversal of 54989861 is 16898945.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38130625 + 16859236 = 6175^2 + 4106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54989861 is a prime.

Together with 54989863, 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 (54989863) 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, 27494930 + 27494931.

It is an arithmetic number, because the mean of its divisors is an integer number (27494931).

Almost surely, 2^54989861 is an apocalyptic number.

It is an amenable number.

54989861 is a deficient number, since it is larger than the sum of its proper divisors (1).

54989861 is an equidigital number, since it uses as much as digits as its factorization.

54989861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 50.

The square root of 54989861 is about 7415.5148843489. The cubic root of 54989861 is about 380.2718760734.

The spelling of 54989861 in words is "fifty-four million, nine hundred eighty-nine thousand, eight hundred sixty-one".