91169575249 has 3 divisors (see below), whose sum is σ = 91169877193. Its totient is φ = 91169273306.

The previous prime is 91169575219. The next prime is 91169575297. The reversal of 91169575249 is 94257596119.

The square root of 91169575249 is 301943.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 91169575249 - 2⁷ = 91169575121 is a prime.

It is a super-3 number, since 3×91169575249³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91169575193 and 91169575202.

It is not an unprimeable number, because it can be changed into a prime (91169575219) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 150972 + ... + 452914.

Almost surely, 2^91169575249 is an apocalyptic number.

91169575249 is the 301943-rd square number.

91169575249 is the 150972-nd centered octagonal number.

It is an amenable number.

91169575249 is a deficient number, since it is larger than the sum of its proper divisors (301944).

91169575249 is an frugal number, since it uses more digits than its factorization.

91169575249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603886 (or 301943 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 58.

The spelling of 91169575249 in words is "ninety-one billion, one hundred sixty-nine million, five hundred seventy-five thousand, two hundred forty-nine".