961691 has 2 divisors, whose sum is σ = 961692. Its totient is φ = 961690.

The previous prime is 961687. The next prime is 961703. The reversal of 961691 is 196169.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (196169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961691 - 2² = 961687 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (961601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480845 + 480846.

It is an arithmetic number, because the mean of its divisors is an integer number (480846).

2⁹⁶¹⁶⁹¹ is an apocalyptic number.

961691 is a deficient number, since it is larger than the sum of its proper divisors (1).

961691 is an equidigital number, since it uses as much as digits as its factorization.

961691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 961691 is about 980.6584522656. The cubic root of 961691 is about 98.7063707284.

The spelling of 961691 in words is "nine hundred sixty-one thousand, six hundred ninety-one".