91010261 has 2 divisors, whose sum is σ = 91010262. Its totient is φ = 91010260.

The previous prime is 91010237. The next prime is 91010279. The reversal of 91010261 is 16201019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90136036 + 874225 = 9494^2 + 935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91010261 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 (91010281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45505130 + 45505131.

It is an arithmetic number, because the mean of its divisors is an integer number (45505131).

Almost surely, 2^91010261 is an apocalyptic number.

It is an amenable number.

91010261 is a deficient number, since it is larger than the sum of its proper divisors (1).

91010261 is an equidigital number, since it uses as much as digits as its factorization.

91010261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 91010261 is about 9539.9298215448. The cubic root of 91010261 is about 449.8110498911.

The spelling of 91010261 in words is "ninety-one million, ten thousand, two hundred sixty-one".