126438181 has 4 divisors (see below), whose sum is σ = 130516864. Its totient is φ = 122359500.

The previous prime is 126438161. The next prime is 126438227. The reversal of 126438181 is 181834621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181834621 = 71 ⋅2561051.

It is a cyclic number.

It is not a de Polignac number, because 126438181 - 2¹¹ = 126436133 is a prime.

It is a super-2 number, since 2×126438181² = 31973227229177522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126438161) 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, 2039295 + ... + 2039356.

It is an arithmetic number, because the mean of its divisors is an integer number (32629216).

Almost surely, 2^126438181 is an apocalyptic number.

It is an amenable number.

126438181 is a deficient number, since it is larger than the sum of its proper divisors (4078683).

126438181 is an equidigital number, since it uses as much as digits as its factorization.

126438181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4078682.

The product of its digits is 9216, while the sum is 34.

The square root of 126438181 is about 11244.4733536080. The cubic root of 126438181 is about 501.9102671312.

The spelling of 126438181 in words is "one hundred twenty-six million, four hundred thirty-eight thousand, one hundred eighty-one".