91949785 has 4 divisors (see below), whose sum is σ = 110339748. Its totient is φ = 73559824.

The previous prime is 91949779. The next prime is 91949801. The reversal of 91949785 is 58794919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58794919 = 29 ⋅2027411.

It can be written as a sum of positive squares in 2 ways, for example, as 38601369 + 53348416 = 6213^2 + 7304^2 .

It is a cyclic number.

It is not a de Polignac number, because 91949785 - 2³ = 91949777 is a prime.

It is a Duffinian 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, 9194974 + ... + 9194983.

It is an arithmetic number, because the mean of its divisors is an integer number (27584937).

Almost surely, 2^91949785 is an apocalyptic number.

It is an amenable number.

91949785 is a deficient number, since it is larger than the sum of its proper divisors (18389963).

91949785 is a wasteful number, since it uses less digits than its factorization.

91949785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18389962.

The product of its digits is 816480, while the sum is 52.

The square root of 91949785 is about 9589.0450515158. The cubic root of 91949785 is about 451.3535951001.

The spelling of 91949785 in words is "ninety-one million, nine hundred forty-nine thousand, seven hundred eighty-five".