689812027 has 2 divisors, whose sum is σ = 689812028. Its totient is φ = 689812026.

The previous prime is 689811959. The next prime is 689812049. The reversal of 689812027 is 720218986.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689812027 is a prime.

It is not a weakly prime, because it can be changed into another prime (689812427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344906013 + 344906014.

It is an arithmetic number, because the mean of its divisors is an integer number (344906014).

Almost surely, 2^689812027 is an apocalyptic number.

689812027 is a deficient number, since it is larger than the sum of its proper divisors (1).

689812027 is an equidigital number, since it uses as much as digits as its factorization.

689812027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 689812027 is about 26264.2728245044. The cubic root of 689812027 is about 883.5753417677.

The spelling of 689812027 in words is "six hundred eighty-nine million, eight hundred twelve thousand, twenty-seven".