91143109 has 2 divisors, whose sum is σ = 91143110. Its totient is φ = 91143108.

The previous prime is 91143079. The next prime is 91143113. The reversal of 91143109 is 90134119.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86434209 + 4708900 = 9297^2 + 2170^2 .

It is a cyclic number.

It is not a de Polignac number, because 91143109 - 2⁵ = 91143077 is a prime.

It is a super-3 number, since 3×91143109³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91143509) 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, 45571554 + 45571555.

It is an arithmetic number, because the mean of its divisors is an integer number (45571555).

Almost surely, 2^91143109 is an apocalyptic number.

It is an amenable number.

91143109 is a deficient number, since it is larger than the sum of its proper divisors (1).

91143109 is an equidigital number, since it uses as much as digits as its factorization.

91143109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 91143109 is about 9546.8900171731. The cubic root of 91143109 is about 450.0298070791.

The spelling of 91143109 in words is "ninety-one million, one hundred forty-three thousand, one hundred nine".