91645947 has 24 divisors (see below), whose sum is σ = 136216080. Its totient is φ = 59339520.

The previous prime is 91645937. The next prime is 91645979. The reversal of 91645947 is 74954619.

It is not a de Polignac number, because 91645947 - 2⁷ = 91645819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91645907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112879 + ... + 113687.

It is an arithmetic number, because the mean of its divisors is an integer number (5675670).

Almost surely, 2^91645947 is an apocalyptic number.

91645947 is a deficient number, since it is larger than the sum of its proper divisors (44570133).

91645947 is a wasteful number, since it uses less digits than its factorization.

91645947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163 (or 1160 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 91645947 is about 9573.1889671102. The cubic root of 91645947 is about 450.8558969835.

The spelling of 91645947 in words is "ninety-one million, six hundred forty-five thousand, nine hundred forty-seven".