91069969 has 12 divisors (see below), whose sum is σ = 97332508. Its totient is φ = 85190400.

The previous prime is 91069963. The next prime is 91069991. The reversal of 91069969 is 96996019.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 15171025 + 75898944 = 3895^2 + 8712^2 .

It is not a de Polignac number, because 91069969 - 2³ = 91069961 is a prime.

It is a super-4 number, since 4×91069969⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91069961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51439 + ... + 53179.

Almost surely, 2^91069969 is an apocalyptic number.

It is an amenable number.

91069969 is a deficient number, since it is larger than the sum of its proper divisors (6262539).

91069969 is a wasteful number, since it uses less digits than its factorization.

91069969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956 (or 1939 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 91069969 is about 9543.0586815758. The cubic root of 91069969 is about 449.9093957505.

The spelling of 91069969 in words is "ninety-one million, sixty-nine thousand, nine hundred sixty-nine".