12161431 has 2 divisors, whose sum is σ = 12161432. Its totient is φ = 12161430.

The previous prime is 12161417. The next prime is 12161437. The reversal of 12161431 is 13416121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12161431 - 2¹¹ = 12159383 is a prime.

It is a super-2 number, since 2×12161431² = 295800807935522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12161399 and 12161408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12161437) 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 as a sum of consecutive naturals, namely, 6080715 + 6080716.

It is an arithmetic number, because the mean of its divisors is an integer number (6080716).

Almost surely, 2^12161431 is an apocalyptic number.

12161431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12161431 is an equidigital number, since it uses as much as digits as its factorization.

12161431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 12161431 is about 3487.3243324933. The cubic root of 12161431 is about 229.9649032773.

Adding to 12161431 its reverse (13416121), we get a palindrome (25577552).

The spelling of 12161431 in words is "twelve million, one hundred sixty-one thousand, four hundred thirty-one".