91961669 has 2 divisors, whose sum is σ = 91961670. Its totient is φ = 91961668.

The previous prime is 91961633. The next prime is 91961711. The reversal of 91961669 is 96616919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57304900 + 34656769 = 7570^2 + 5887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91961669 is a prime.

It is a super-3 number, since 3×91961669³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91961629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45980834 + 45980835.

It is an arithmetic number, because the mean of its divisors is an integer number (45980835).

Almost surely, 2^91961669 is an apocalyptic number.

It is an amenable number.

91961669 is a deficient number, since it is larger than the sum of its proper divisors (1).

91961669 is an equidigital number, since it uses as much as digits as its factorization.

91961669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 47.

The square root of 91961669 is about 9589.6646969537. The cubic root of 91961669 is about 451.3730392459.

The spelling of 91961669 in words is "ninety-one million, nine hundred sixty-one thousand, six hundred sixty-nine".