53985989 has 2 divisors, whose sum is σ = 53985990. Its totient is φ = 53985988.

The previous prime is 53985983. The next prime is 53986021. The reversal of 53985989 is 98958935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41383489 + 12602500 = 6433^2 + 3550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53985989 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53985983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26992994 + 26992995.

It is an arithmetic number, because the mean of its divisors is an integer number (26992995).

Almost surely, 2^53985989 is an apocalyptic number.

It is an amenable number.

53985989 is a deficient number, since it is larger than the sum of its proper divisors (1).

53985989 is an equidigital number, since it uses as much as digits as its factorization.

53985989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 56.

The square root of 53985989 is about 7347.5158387036. The cubic root of 53985989 is about 377.9436218559.

The spelling of 53985989 in words is "fifty-three million, nine hundred eighty-five thousand, nine hundred eighty-nine".