53991089 has 2 divisors, whose sum is σ = 53991090. Its totient is φ = 53991088.

The previous prime is 53991071. The next prime is 53991121. The reversal of 53991089 is 98019935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34339600 + 19651489 = 5860^2 + 4433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53991089 is a prime.

It is not a weakly prime, because it can be changed into another prime (53091089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26995544 + 26995545.

It is an arithmetic number, because the mean of its divisors is an integer number (26995545).

Almost surely, 2^53991089 is an apocalyptic number.

It is an amenable number.

53991089 is a deficient number, since it is larger than the sum of its proper divisors (1).

53991089 is an equidigital number, since it uses as much as digits as its factorization.

53991089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 53991089 is about 7347.8628865814. The cubic root of 53991089 is about 377.9555227942.

The spelling of 53991089 in words is "fifty-three million, nine hundred ninety-one thousand, eighty-nine".