91001843 has 2 divisors, whose sum is σ = 91001844. Its totient is φ = 91001842.

The previous prime is 91001821. The next prime is 91001863. The reversal of 91001843 is 34810019.

It is a strong prime.

It is an emirp because it is prime and its reverse (34810019) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91001843 is a prime.

It is not a weakly prime, because it can be changed into another prime (91001863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500921 + 45500922.

It is an arithmetic number, because the mean of its divisors is an integer number (45500922).

Almost surely, 2^91001843 is an apocalyptic number.

91001843 is a deficient number, since it is larger than the sum of its proper divisors (1).

91001843 is an equidigital number, since it uses as much as digits as its factorization.

91001843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 91001843 is about 9539.4886131281. The cubic root of 91001843 is about 449.7971810294.

The spelling of 91001843 in words is "ninety-one million, one thousand, eight hundred forty-three".