91917869 has 2 divisors, whose sum is σ = 91917870. Its totient is φ = 91917868.

The previous prime is 91917851. The next prime is 91917887. The reversal of 91917869 is 96871919.

It is a balanced prime because it is at equal distance from previous prime (91917851) and next prime (91917887).

It can be written as a sum of positive squares in only one way, i.e., 90060100 + 1857769 = 9490^2 + 1363^2 .

It is a cyclic number.

It is not a de Polignac number, because 91917869 - 2¹⁶ = 91852333 is a prime.

It is a super-2 number, since 2×91917869² = 16897789283002322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91917809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45958934 + 45958935.

It is an arithmetic number, because the mean of its divisors is an integer number (45958935).

Almost surely, 2^91917869 is an apocalyptic number.

It is an amenable number.

91917869 is a deficient number, since it is larger than the sum of its proper divisors (1).

91917869 is an equidigital number, since it uses as much as digits as its factorization.

91917869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 50.

The square root of 91917869 is about 9587.3807163375. The cubic root of 91917869 is about 451.3013670702.

The spelling of 91917869 in words is "ninety-one million, nine hundred seventeen thousand, eight hundred sixty-nine".