91069947 has 32 divisors (see below), whose sum is σ = 141004800. Its totient is φ = 58018464.

The previous prime is 91069933. The next prime is 91069961. The reversal of 91069947 is 74996019.

It is an interprime number because it is at equal distance from previous prime (91069933) and next prime (91069961).

It is not a de Polignac number, because 91069947 - 2⁴ = 91069931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91069997) 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 31 ways as a sum of consecutive naturals, for example, 83238 + ... + 84324.

It is an arithmetic number, because the mean of its divisors is an integer number (4406400).

Almost surely, 2^91069947 is an apocalyptic number.

91069947 is a deficient number, since it is larger than the sum of its proper divisors (49934853).

91069947 is a wasteful number, since it uses less digits than its factorization.

91069947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 91069947 is about 9543.0575289055. The cubic root of 91069947 is about 449.9093595219.

The spelling of 91069947 in words is "ninety-one million, sixty-nine thousand, nine hundred forty-seven".