126171861 has 4 divisors (see below), whose sum is σ = 168229152. Its totient is φ = 84114572.

The previous prime is 126171827. The next prime is 126171889. The reversal of 126171861 is 168171621.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-126171861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126171361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21028641 + ... + 21028646.

It is an arithmetic number, because the mean of its divisors is an integer number (42057288).

Almost surely, 2^126171861 is an apocalyptic number.

It is an amenable number.

126171861 is a deficient number, since it is larger than the sum of its proper divisors (42057291).

126171861 is an equidigital number, since it uses as much as digits as its factorization.

126171861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42057290.

The product of its digits is 4032, while the sum is 33.

The square root of 126171861 is about 11232.6248490725. The cubic root of 126171861 is about 501.5576239100.

The spelling of 126171861 in words is "one hundred twenty-six million, one hundred seventy-one thousand, eight hundred sixty-one".