91137268 has 12 divisors (see below), whose sum is σ = 159560100. Its totient is φ = 45548672.

The previous prime is 91137259. The next prime is 91137287. The reversal of 91137268 is 86273119.

It can be written as a sum of positive squares in 2 ways, for example, as 82773604 + 8363664 = 9098^2 + 2892^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10908 + ... + 17356.

It is an arithmetic number, because the mean of its divisors is an integer number (13296675).

Almost surely, 2^91137268 is an apocalyptic number.

It is an amenable number.

91137268 is a deficient number, since it is larger than the sum of its proper divisors (68422832).

91137268 is a wasteful number, since it uses less digits than its factorization.

91137268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9986 (or 9984 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 91137268 is about 9546.5841011327. The cubic root of 91137268 is about 450.0201933325.

The spelling of 91137268 in words is "ninety-one million, one hundred thirty-seven thousand, two hundred sixty-eight".