91274149 has 2 divisors, whose sum is σ = 91274150. Its totient is φ = 91274148.

The previous prime is 91274147. The next prime is 91274179. The reversal of 91274149 is 94147219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77264100 + 14010049 = 8790^2 + 3743^2 .

It is a cyclic number.

It is not a de Polignac number, because 91274149 - 2¹ = 91274147 is a prime.

Together with 91274147, 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 (91274147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45637074 + 45637075.

It is an arithmetic number, because the mean of its divisors is an integer number (45637075).

Almost surely, 2^91274149 is an apocalyptic number.

It is an amenable number.

91274149 is a deficient number, since it is larger than the sum of its proper divisors (1).

91274149 is an equidigital number, since it uses as much as digits as its factorization.

91274149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 91274149 is about 9553.7505200837. The cubic root of 91274149 is about 450.2453789311.

The spelling of 91274149 in words is "ninety-one million, two hundred seventy-four thousand, one hundred forty-nine".