91125565 has 8 divisors (see below), whose sum is σ = 110186208. Its totient is φ = 72343440.

The previous prime is 91125553. The next prime is 91125571. The reversal of 91125565 is 56552119.

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

It is not a de Polignac number, because 91125565 - 2¹³ = 91117373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91125565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68907 + ... + 70216.

It is an arithmetic number, because the mean of its divisors is an integer number (13773276).

Almost surely, 2^91125565 is an apocalyptic number.

It is an amenable number.

91125565 is a deficient number, since it is larger than the sum of its proper divisors (19060643).

91125565 is a wasteful number, since it uses less digits than its factorization.

91125565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139259.

The product of its digits is 13500, while the sum is 34.

The square root of 91125565 is about 9545.9711397008. The cubic root of 91125565 is about 450.0009300392. Note that the first 3 decimals are identical.

The spelling of 91125565 in words is "ninety-one million, one hundred twenty-five thousand, five hundred sixty-five".