689291593 has 2 divisors, whose sum is σ = 689291594. Its totient is φ = 689291592.

The previous prime is 689291567. The next prime is 689291599. The reversal of 689291593 is 395192986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 446181129 + 243110464 = 21123^2 + 15592^2 .

It is a cyclic number.

It is not a de Polignac number, because 689291593 - 2²⁵ = 655737161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689291593.

It is not a weakly prime, because it can be changed into another prime (689291599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344645796 + 344645797.

It is an arithmetic number, because the mean of its divisors is an integer number (344645797).

Almost surely, 2^689291593 is an apocalyptic number.

It is an amenable number.

689291593 is a deficient number, since it is larger than the sum of its proper divisors (1).

689291593 is an equidigital number, since it uses as much as digits as its factorization.

689291593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 52.

The square root of 689291593 is about 26254.3633135523. The cubic root of 689291593 is about 883.3530791203.

The spelling of 689291593 in words is "six hundred eighty-nine million, two hundred ninety-one thousand, five hundred ninety-three".