9781291 has 8 divisors (see below), whose sum is σ = 10611440. Its totient is φ = 8962272.

The previous prime is 9781267. The next prime is 9781297. The reversal of 9781291 is 1921879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9781291 - 2⁵ = 9781259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9781291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9781297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900 + ... + 4513.

It is an arithmetic number, because the mean of its divisors is an integer number (1326430).

Almost surely, 2^9781291 is an apocalyptic number.

9781291 is a deficient number, since it is larger than the sum of its proper divisors (830149).

9781291 is a wasteful number, since it uses less digits than its factorization.

9781291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5565.

The product of its digits is 9072, while the sum is 37.

The square root of 9781291 is about 3127.5055555506. The cubic root of 9781291 is about 213.8612297986.

It can be divided in two parts, 97812 and 91, that added together give a triangular number (97903 = T₄₄₂).

The spelling of 9781291 in words is "nine million, seven hundred eighty-one thousand, two hundred ninety-one".