9615891 has 4 divisors (see below), whose sum is σ = 12821192. Its totient is φ = 6410592.

The previous prime is 9615889. The next prime is 9615911. The reversal of 9615891 is 1985169.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9615891 - 2¹ = 9615889 is a prime.

It is a Duffinian number.

9615891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9615811) 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, 1602646 + ... + 1602651.

It is an arithmetic number, because the mean of its divisors is an integer number (3205298).

Almost surely, 2^9615891 is an apocalyptic number.

9615891 is a deficient number, since it is larger than the sum of its proper divisors (3205301).

9615891 is a wasteful number, since it uses less digits than its factorization.

9615891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205300.

The product of its digits is 19440, while the sum is 39.

The square root of 9615891 is about 3100.9500157210. The cubic root of 9615891 is about 212.6489179913.

The spelling of 9615891 in words is "nine million, six hundred fifteen thousand, eight hundred ninety-one".