91140061 has 2 divisors, whose sum is σ = 91140062. Its totient is φ = 91140060.

The previous prime is 91139999. The next prime is 91140067. The reversal of 91140061 is 16004119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47183161 + 43956900 = 6869^2 + 6630^2 .

It is an emirp because it is prime and its reverse (16004119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91140061 - 2⁷ = 91139933 is a prime.

It is a super-3 number, since 3×91140061³ (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 (91140067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45570030 + 45570031.

It is an arithmetic number, because the mean of its divisors is an integer number (45570031).

Almost surely, 2^91140061 is an apocalyptic number.

It is an amenable number.

91140061 is a deficient number, since it is larger than the sum of its proper divisors (1).

91140061 is an equidigital number, since it uses as much as digits as its factorization.

91140061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 91140061 is about 9546.7303827017. The cubic root of 91140061 is about 450.0247904038.

The spelling of 91140061 in words is "ninety-one million, one hundred forty thousand, sixty-one".