91017149 has 2 divisors, whose sum is σ = 91017150. Its totient is φ = 91017148.

The previous prime is 91017131. The next prime is 91017169. The reversal of 91017149 is 94171019.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 196249 = 9530^2 + 443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91017149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91017119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45508574 + 45508575.

It is an arithmetic number, because the mean of its divisors is an integer number (45508575).

Almost surely, 2^91017149 is an apocalyptic number.

It is an amenable number.

91017149 is a deficient number, since it is larger than the sum of its proper divisors (1).

91017149 is an equidigital number, since it uses as much as digits as its factorization.

91017149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 91017149 is about 9540.2908236594. The cubic root of 91017149 is about 449.8223974041.

The spelling of 91017149 in words is "ninety-one million, seventeen thousand, one hundred forty-nine".