91191743 has 2 divisors, whose sum is σ = 91191744. Its totient is φ = 91191742.

The previous prime is 91191679. The next prime is 91191781. The reversal of 91191743 is 34719119.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91191743 - 2⁶ = 91191679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91191143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45595871 + 45595872.

It is an arithmetic number, because the mean of its divisors is an integer number (45595872).

Almost surely, 2^91191743 is an apocalyptic number.

91191743 is a deficient number, since it is larger than the sum of its proper divisors (1).

91191743 is an equidigital number, since it uses as much as digits as its factorization.

91191743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 91191743 is about 9549.4367896751. The cubic root of 91191743 is about 450.1098382085.

The spelling of 91191743 in words is "ninety-one million, one hundred ninety-one thousand, seven hundred forty-three".