91125569 has 8 divisors (see below), whose sum is σ = 94905000. Its totient is φ = 87388672.

The previous prime is 91125553. The next prime is 91125571. The reversal of 91125569 is 96552119.

It can be written as a sum of positive squares in 4 ways, for example, as 22848400 + 68277169 = 4780^2 + 8263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91125569 - 2⁴ = 91125553 is a prime.

It is a super-2 number, since 2×91125569² = 16607738651147522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91125509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6224 + ... + 14865.

It is an arithmetic number, because the mean of its divisors is an integer number (11863125).

Almost surely, 2^91125569 is an apocalyptic number.

It is an amenable number.

91125569 is a deficient number, since it is larger than the sum of its proper divisors (3779431).

91125569 is a wasteful number, since it uses less digits than its factorization.

91125569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21267.

The product of its digits is 24300, while the sum is 38.

The square root of 91125569 is about 9545.9713492132. The cubic root of 91125569 is about 450.0009366236. Note that the first 3 decimals are identical.

The spelling of 91125569 in words is "ninety-one million, one hundred twenty-five thousand, five hundred sixty-nine".