91159949 has 2 divisors, whose sum is σ = 91159950. Its totient is φ = 91159948.

The previous prime is 91159919. The next prime is 91159951. The reversal of 91159949 is 94995119.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79477225 + 11682724 = 8915^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 91159949 - 2⁸ = 91159693 is a prime.

It is a super-3 number, since 3×91159949³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 91159951, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91159909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45579974 + 45579975.

It is an arithmetic number, because the mean of its divisors is an integer number (45579975).

Almost surely, 2^91159949 is an apocalyptic number.

It is an amenable number.

91159949 is a deficient number, since it is larger than the sum of its proper divisors (1).

91159949 is an equidigital number, since it uses as much as digits as its factorization.

91159949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 47.

The square root of 91159949 is about 9547.7719390442. The cubic root of 91159949 is about 450.0575218650.

The spelling of 91159949 in words is "ninety-one million, one hundred fifty-nine thousand, nine hundred forty-nine".