689667197 has 2 divisors, whose sum is σ = 689667198. Its totient is φ = 689667196.

The previous prime is 689667157. The next prime is 689667221. The reversal of 689667197 is 791766986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571162201 + 118504996 = 23899^2 + 10886^2 .

It is a cyclic number.

It is not a de Polignac number, because 689667197 - 2⁶ = 689667133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689667127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344833598 + 344833599.

It is an arithmetic number, because the mean of its divisors is an integer number (344833599).

Almost surely, 2^689667197 is an apocalyptic number.

It is an amenable number.

689667197 is a deficient number, since it is larger than the sum of its proper divisors (1).

689667197 is an equidigital number, since it uses as much as digits as its factorization.

689667197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 59.

The square root of 689667197 is about 26261.5155122472. The cubic root of 689667197 is about 883.5135001989.

The spelling of 689667197 in words is "six hundred eighty-nine million, six hundred sixty-seven thousand, one hundred ninety-seven".