9957181 has 16 divisors (see below), whose sum is σ = 11167744. Its totient is φ = 8817984.

The previous prime is 9957161. The next prime is 9957187. The reversal of 9957181 is 1817599.

It is a happy number.

9957181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9957181 - 2²¹ = 7860029 is a prime.

It is a super-2 number, since 2×9957181² = 198290906933522, which contains 22 as substring.

It is the 3156-th Hogben number.

It is a Duffinian number.

9957181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9957187) by changing a digit.

It is a nontrivial repunit in base 3155.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61006 + ... + 61168.

It is an arithmetic number, because the mean of its divisors is an integer number (697984).

Almost surely, 2^9957181 is an apocalyptic number.

It is an amenable number.

9957181 is a deficient number, since it is larger than the sum of its proper divisors (1210563).

9957181 is a wasteful number, since it uses less digits than its factorization.

9957181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its digits is 22680, while the sum is 40.

The square root of 9957181 is about 3155.5001188401. The cubic root of 9957181 is about 215.1355265946.

The spelling of 9957181 in words is "nine million, nine hundred fifty-seven thousand, one hundred eighty-one".