91147577 has 2 divisors, whose sum is σ = 91147578. Its totient is φ = 91147576.

The previous prime is 91147571. The next prime is 91147673. The reversal of 91147577 is 77574119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85174441 + 5973136 = 9229^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 91147577 - 2²⁰ = 90099001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91147571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45573788 + 45573789.

It is an arithmetic number, because the mean of its divisors is an integer number (45573789).

Almost surely, 2^91147577 is an apocalyptic number.

It is an amenable number.

91147577 is a deficient number, since it is larger than the sum of its proper divisors (1).

91147577 is an equidigital number, since it uses as much as digits as its factorization.

91147577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 41.

The square root of 91147577 is about 9547.1240172106. The cubic root of 91147577 is about 450.0371607172.

The spelling of 91147577 in words is "ninety-one million, one hundred forty-seven thousand, five hundred seventy-seven".