91649147 has 2 divisors, whose sum is σ = 91649148. Its totient is φ = 91649146.

The previous prime is 91649119. The next prime is 91649171. The reversal of 91649147 is 74194619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91649147 - 2⁶ = 91649083 is a prime.

It is a super-2 number, since 2×91649147² = 16799132291655218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91649197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45824573 + 45824574.

It is an arithmetic number, because the mean of its divisors is an integer number (45824574).

Almost surely, 2^91649147 is an apocalyptic number.

91649147 is a deficient number, since it is larger than the sum of its proper divisors (1).

91649147 is an equidigital number, since it uses as much as digits as its factorization.

91649147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 91649147 is about 9573.3560990909. The cubic root of 91649147 is about 450.8611444317.

The spelling of 91649147 in words is "ninety-one million, six hundred forty-nine thousand, one hundred forty-seven".