91140547 has 2 divisors, whose sum is σ = 91140548. Its totient is φ = 91140546.

The previous prime is 91140523. The next prime is 91140563. The reversal of 91140547 is 74504119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91140547 - 2⁷ = 91140419 is a prime.

It is not a weakly prime, because it can be changed into another prime (91140347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45570273 + 45570274.

It is an arithmetic number, because the mean of its divisors is an integer number (45570274).

Almost surely, 2^91140547 is an apocalyptic number.

91140547 is a deficient number, since it is larger than the sum of its proper divisors (1).

91140547 is an equidigital number, since it uses as much as digits as its factorization.

91140547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 91140547 is about 9546.7558364085. The cubic root of 91140547 is about 450.0255903143.

The spelling of 91140547 in words is "ninety-one million, one hundred forty thousand, five hundred forty-seven".