12961831 has 4 divisors (see below), whose sum is σ = 13144464. Its totient is φ = 12779200.

The previous prime is 12961789. The next prime is 12961841. The reversal of 12961831 is 13816921.

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

It is a cyclic number.

It is not a de Polignac number, because 12961831 - 2¹⁹ = 12437543 is a prime.

It is a super-2 number, since 2×12961831² = 336018125745122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12961793 and 12961802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12961841) 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, 91210 + ... + 91351.

It is an arithmetic number, because the mean of its divisors is an integer number (3286116).

Almost surely, 2^12961831 is an apocalyptic number.

12961831 is a deficient number, since it is larger than the sum of its proper divisors (182633).

12961831 is an equidigital number, since it uses as much as digits as its factorization.

12961831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182632.

The product of its digits is 2592, while the sum is 31.

The square root of 12961831 is about 3600.2542965741. The cubic root of 12961831 is about 234.9031198669.

The spelling of 12961831 in words is "twelve million, nine hundred sixty-one thousand, eight hundred thirty-one".