689221867 has 2 divisors, whose sum is σ = 689221868. Its totient is φ = 689221866.

The previous prime is 689221861. The next prime is 689221913. The reversal of 689221867 is 768122986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689221867 - 2¹¹ = 689219819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689221867.

It is not a weakly prime, because it can be changed into another prime (689221861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344610933 + 344610934.

It is an arithmetic number, because the mean of its divisors is an integer number (344610934).

Almost surely, 2^689221867 is an apocalyptic number.

689221867 is a deficient number, since it is larger than the sum of its proper divisors (1).

689221867 is an equidigital number, since it uses as much as digits as its factorization.

689221867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 689221867 is about 26253.0353864082. The cubic root of 689221867 is about 883.3232926195.

The spelling of 689221867 in words is "six hundred eighty-nine million, two hundred twenty-one thousand, eight hundred sixty-seven".