126181 has 4 divisors (see below), whose sum is σ = 137664. Its totient is φ = 114700.

The previous prime is 126173. The next prime is 126199. The reversal of 126181 is 181621.

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.

It is a cyclic number.

It is not a de Polignac number, because 126181 - 2³ = 126173 is a prime.

It is a super-2 number, since 2×126181² = 31843289522, 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 (126131) 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, 5725 + ... + 5746.

It is an arithmetic number, because the mean of its divisors is an integer number (34416).

2¹²⁶¹⁸¹ is an apocalyptic number.

126181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126181 is a deficient number, since it is larger than the sum of its proper divisors (11483).

126181 is a wasteful number, since it uses less digits than its factorization.

126181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11482.

The product of its digits is 96, while the sum is 19.

The square root of 126181 is about 355.2196503574. The cubic root of 126181 is about 50.1569733384.

The spelling of 126181 in words is "one hundred twenty-six thousand, one hundred eighty-one".