9640091 has 4 divisors (see below), whose sum is σ = 9900672.
Its totient is φ = 9379512.
The previous prime is 9640061. The next prime is 9640109. The reversal of 9640091 is 1900469.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1900469 = 1103 ⋅1723.
It is a cyclic number.
It is not a de Polignac number, because 9640091 - 218 = 9377947 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (9640021) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130235 + ... + 130308.
It is an arithmetic number, because the mean of its divisors is an integer number (2475168).
Almost surely, 29640091 is an apocalyptic number.
9640091 is a deficient number, since it is larger than the sum of its proper divisors (260581).
9640091 is a wasteful number, since it uses less digits than its factorization.
9640091 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 260580.
The product of its (nonzero) digits is 1944, while the sum is 29.
The square root of 9640091 is about 3104.8495937807.
The cubic root of 9640091 is about 212.8271574226.
The spelling of 9640091 in words is "nine million, six hundred forty thousand, ninety-one".