961188689 has 2 divisors, whose sum is σ = 961188690. Its totient is φ = 961188688.

The previous prime is 961188677. The next prime is 961188691. The reversal of 961188689 is 986881169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529920400 + 431268289 = 23020^2 + 20767^2 .

It is a cyclic number.

It is not a de Polignac number, because 961188689 - 2¹² = 961184593 is a prime.

Together with 961188691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (961188629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480594344 + 480594345.

It is an arithmetic number, because the mean of its divisors is an integer number (480594345).

Almost surely, 2^961188689 is an apocalyptic number.

It is an amenable number.

961188689 is a deficient number, since it is larger than the sum of its proper divisors (1).

961188689 is an equidigital number, since it uses as much as digits as its factorization.

961188689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 56.

The square root of 961188689 is about 31003.0432215936. The cubic root of 961188689 is about 986.8918227914.

The spelling of 961188689 in words is "nine hundred sixty-one million, one hundred eighty-eight thousand, six hundred eighty-nine".