689053993 has 2 divisors, whose sum is σ = 689053994. Its totient is φ = 689053992.

The previous prime is 689053903. The next prime is 689054021. The reversal of 689053993 is 399350986.

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., 595506409 + 93547584 = 24403^2 + 9672^2 .

It is a cyclic number.

It is not a de Polignac number, because 689053993 - 2¹³ = 689045801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689053993.

It is not a weakly prime, because it can be changed into another prime (689053903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344526996 + 344526997.

It is an arithmetic number, because the mean of its divisors is an integer number (344526997).

Almost surely, 2^689053993 is an apocalyptic number.

It is an amenable number.

689053993 is a deficient number, since it is larger than the sum of its proper divisors (1).

689053993 is an equidigital number, since it uses as much as digits as its factorization.

689053993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 689053993 is about 26249.8379614046. The cubic root of 689053993 is about 883.2515696797.

The spelling of 689053993 in words is "six hundred eighty-nine million, fifty-three thousand, nine hundred ninety-three".