689201861 has 2 divisors, whose sum is σ = 689201862. Its totient is φ = 689201860.

The previous prime is 689201741. The next prime is 689201921. The reversal of 689201861 is 168102986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420045025 + 269156836 = 20495^2 + 16406^2 .

It is a cyclic number.

It is not a de Polignac number, because 689201861 - 2¹⁴ = 689185477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689209861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344600930 + 344600931.

It is an arithmetic number, because the mean of its divisors is an integer number (344600931).

Almost surely, 2^689201861 is an apocalyptic number.

It is an amenable number.

689201861 is a deficient number, since it is larger than the sum of its proper divisors (1).

689201861 is an equidigital number, since it uses as much as digits as its factorization.

689201861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 689201861 is about 26252.6543610356. The cubic root of 689201861 is about 883.3147458135.

The spelling of 689201861 in words is "six hundred eighty-nine million, two hundred one thousand, eight hundred sixty-one".