91129471 has 2 divisors, whose sum is σ = 91129472. Its totient is φ = 91129470.

The previous prime is 91129459. The next prime is 91129481. The reversal of 91129471 is 17492119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91129471 - 2⁷ = 91129343 is a prime.

It is a super-3 number, since 3×91129471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91129411) 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, 45564735 + 45564736.

It is an arithmetic number, because the mean of its divisors is an integer number (45564736).

Almost surely, 2^91129471 is an apocalyptic number.

91129471 is a deficient number, since it is larger than the sum of its proper divisors (1).

91129471 is an equidigital number, since it uses as much as digits as its factorization.

91129471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 91129471 is about 9546.1757264362. The cubic root of 91129471 is about 450.0073595504.

The spelling of 91129471 in words is "ninety-one million, one hundred twenty-nine thousand, four hundred seventy-one".