91075549 has 2 divisors, whose sum is σ = 91075550. Its totient is φ = 91075548.

The previous prime is 91075547. The next prime is 91075577. The reversal of 91075549 is 94557019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64480900 + 26594649 = 8030^2 + 5157^2 .

It is a cyclic number.

It is not a de Polignac number, because 91075549 - 2¹ = 91075547 is a prime.

Together with 91075547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91075547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45537774 + 45537775.

It is an arithmetic number, because the mean of its divisors is an integer number (45537775).

Almost surely, 2^91075549 is an apocalyptic number.

It is an amenable number.

91075549 is a deficient number, since it is larger than the sum of its proper divisors (1).

91075549 is an equidigital number, since it uses as much as digits as its factorization.

91075549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 91075549 is about 9543.3510361927. The cubic root of 91075549 is about 449.9185844479.

The spelling of 91075549 in words is "ninety-one million, seventy-five thousand, five hundred forty-nine".