12142381 has 2 divisors, whose sum is σ = 12142382. Its totient is φ = 12142380.

The previous prime is 12142357. The next prime is 12142393. The reversal of 12142381 is 18324121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 980100 = 3341^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 12142381 - 2¹³ = 12134189 is a prime.

It is a super-2 number, since 2×12142381² = 294874832698322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12142331) 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, 6071190 + 6071191.

It is an arithmetic number, because the mean of its divisors is an integer number (6071191).

Almost surely, 2^12142381 is an apocalyptic number.

It is an amenable number.

12142381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12142381 is an equidigital number, since it uses as much as digits as its factorization.

12142381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 12142381 is about 3484.5919416770. The cubic root of 12142381 is about 229.8447660770.

The spelling of 12142381 in words is "twelve million, one hundred forty-two thousand, three hundred eighty-one".