91043811 has 8 divisors (see below), whose sum is σ = 134879760. Its totient is φ = 60695856.

The previous prime is 91043803. The next prime is 91043819. The reversal of 91043811 is 11834019.

It is an interprime number because it is at equal distance from previous prime (91043803) and next prime (91043819).

It is not a de Polignac number, because 91043811 - 2³ = 91043803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 3371993 = 91043811 / (9 + 1 + 0 + 4 + 3 + 8 + 1 + 1).

It is not an unprimeable number, because it can be changed into a prime (91043819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1685970 + ... + 1686023.

It is an arithmetic number, because the mean of its divisors is an integer number (16859970).

Almost surely, 2^91043811 is an apocalyptic number.

91043811 is a deficient number, since it is larger than the sum of its proper divisors (43835949).

91043811 is a wasteful number, since it uses less digits than its factorization.

91043811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372002 (or 3371996 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 91043811 is about 9541.6880582002. The cubic root of 91043811 is about 449.8663158451.

The spelling of 91043811 in words is "ninety-one million, forty-three thousand, eight hundred eleven".