91228494613 has 8 divisors (see below), whose sum is σ = 91355720888. Its totient is φ = 91101322944.

The previous prime is 91228494569. The next prime is 91228494689. The reversal of 91228494613 is 31649482219.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 71768802609 + 19459692004 = 267897^2 + 139498^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91228494613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91228494013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4210195 + ... + 4231807.

It is an arithmetic number, because the mean of its divisors is an integer number (11419465111).

Almost surely, 2^91228494613 is an apocalyptic number.

It is an amenable number.

91228494613 is a deficient number, since it is larger than the sum of its proper divisors (127226275).

91228494613 is a wasteful number, since it uses less digits than its factorization.

91228494613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27303.

The product of its digits is 746496, while the sum is 49.

The spelling of 91228494613 in words is "ninety-one billion, two hundred twenty-eight million, four hundred ninety-four thousand, six hundred thirteen".