91185001849 has 8 divisors (see below), whose sum is σ = 93311186760. Its totient is φ = 89073843456.

The previous prime is 91185001819. The next prime is 91185001867. The reversal of 91185001849 is 94810058119.

It can be written as a sum of positive squares in 4 ways, for example, as 69888853225 + 21296148624 = 264365^2 + 145932^2 .

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 91185001849 - 2⁹ = 91185001337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91185001799 and 91185001808.

It is not an unprimeable number, because it can be changed into a prime (91185001819) 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, 3744352 + ... + 3768625.

It is an arithmetic number, because the mean of its divisors is an integer number (11663898345).

Almost surely, 2^91185001849 is an apocalyptic number.

It is an amenable number.

91185001849 is a deficient number, since it is larger than the sum of its proper divisors (2126184911).

91185001849 is a wasteful number, since it uses less digits than its factorization.

91185001849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7513259.

The product of its (nonzero) digits is 103680, while the sum is 46.

The spelling of 91185001849 in words is "ninety-one billion, one hundred eighty-five million, one thousand, eight hundred forty-nine".