12381731 has 2 divisors, whose sum is σ = 12381732. Its totient is φ = 12381730.

The previous prime is 12381709. The next prime is 12381757. The reversal of 12381731 is 13718321.

It is an a-pointer prime, because the next prime (12381757) can be obtained adding 12381731 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (13718321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12381731 - 2¹⁰ = 12380707 is a prime.

It is a super-2 number, since 2×12381731² = 306614525112722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12381731.

It is not a weakly prime, because it can be changed into another prime (12381781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6190865 + 6190866.

It is an arithmetic number, because the mean of its divisors is an integer number (6190866).

Almost surely, 2^12381731 is an apocalyptic number.

12381731 is a deficient number, since it is larger than the sum of its proper divisors (1).

12381731 is an equidigital number, since it uses as much as digits as its factorization.

12381731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 12381731 is about 3518.7683924919. The cubic root of 12381731 is about 231.3451796171.

The spelling of 12381731 in words is "twelve million, three hundred eighty-one thousand, seven hundred thirty-one".