91783445 has 8 divisors (see below), whose sum is σ = 118612536. Its totient is φ = 67778496.

The previous prime is 91783441. The next prime is 91783451. The reversal of 91783445 is 54438719.

It can be written as a sum of positive squares in 4 ways, for example, as 64516 + 91718929 = 254^2 + 9577^2 .

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 91783445 - 2² = 91783441 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 (91783441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705962 + ... + 706091.

It is an arithmetic number, because the mean of its divisors is an integer number (14826567).

Almost surely, 2^91783445 is an apocalyptic number.

It is an amenable number.

91783445 is a deficient number, since it is larger than the sum of its proper divisors (26829091).

91783445 is a wasteful number, since it uses less digits than its factorization.

91783445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412071.

The product of its digits is 120960, while the sum is 41.

The square root of 91783445 is about 9580.3676860546. The cubic root of 91783445 is about 451.0812599502.

The spelling of 91783445 in words is "ninety-one million, seven hundred eighty-three thousand, four hundred forty-five".