91969 has 2 divisors, whose sum is σ = 91970. Its totient is φ = 91968.

The previous prime is 91967. The next prime is 91997. The reversal of 91969 is 96919.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82944 + 9025 = 288^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 91969 - 2¹ = 91967 is a prime.

It is a super-3 number, since 3×91969³ = 2333703339618627, which contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 91967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45984 + 45985.

It is an arithmetic number, because the mean of its divisors is an integer number (45985).

2⁹¹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

91969 is a deficient number, since it is larger than the sum of its proper divisors (1).

91969 is an equidigital number, since it uses as much as digits as its factorization.

91969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 34.

The square root of 91969 is about 303.2639114699. The cubic root of 91969 is about 45.1385033112.

Subtracting 91969 from its reverse (96919), we obtain a triangular number (4950 = T₉₉).

The spelling of 91969 in words is "ninety-one thousand, nine hundred sixty-nine".