91974149 has 2 divisors, whose sum is σ = 91974150. Its totient is φ = 91974148.

The previous prime is 91974137. The next prime is 91974191. The reversal of 91974149 is 94147919.

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., 60949249 + 31024900 = 7807^2 + 5570^2 .

It is an emirp because it is prime and its reverse (94147919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91974149 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 (91971149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45987074 + 45987075.

It is an arithmetic number, because the mean of its divisors is an integer number (45987075).

Almost surely, 2^91974149 is an apocalyptic number.

It is an amenable number.

91974149 is a deficient number, since it is larger than the sum of its proper divisors (1).

91974149 is an equidigital number, since it uses as much as digits as its factorization.

91974149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 91974149 is about 9590.3153754191. The cubic root of 91974149 is about 451.3934567408.

The spelling of 91974149 in words is "ninety-one million, nine hundred seventy-four thousand, one hundred forty-nine".