9131861 has 4 divisors (see below), whose sum is σ = 9147372. Its totient is φ = 9116352.

The previous prime is 9131849. The next prime is 9131891. The reversal of 9131861 is 1681319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1681319 = 53 ⋅31723.

It can be written as a sum of positive squares in 2 ways, for example, as 3632836 + 5499025 = 1906^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 9131861 - 2⁶ = 9131797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9131821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6836 + ... + 8061.

It is an arithmetic number, because the mean of its divisors is an integer number (2286843).

Almost surely, 2^9131861 is an apocalyptic number.

It is an amenable number.

9131861 is a deficient number, since it is larger than the sum of its proper divisors (15511).

9131861 is a wasteful number, since it uses less digits than its factorization.

9131861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15510.

The product of its digits is 1296, while the sum is 29.

The square root of 9131861 is about 3021.8969208098. The cubic root of 9131861 is about 209.0193201160.

The spelling of 9131861 in words is "nine million, one hundred thirty-one thousand, eight hundred sixty-one".