91557743 has 2 divisors, whose sum is σ = 91557744. Its totient is φ = 91557742.

The previous prime is 91557737. The next prime is 91557773. The reversal of 91557743 is 34775519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91557743 - 2⁶ = 91557679 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91557743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91557703) 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 as a sum of consecutive naturals, namely, 45778871 + 45778872.

It is an arithmetic number, because the mean of its divisors is an integer number (45778872).

Almost surely, 2^91557743 is an apocalyptic number.

91557743 is a deficient number, since it is larger than the sum of its proper divisors (1).

91557743 is an equidigital number, since it uses as much as digits as its factorization.

91557743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132300, while the sum is 41.

The square root of 91557743 is about 9568.5810337793. The cubic root of 91557743 is about 450.7112095220.

The spelling of 91557743 in words is "ninety-one million, five hundred fifty-seven thousand, seven hundred forty-three".