126111891 has 4 divisors (see below), whose sum is σ = 168149192. Its totient is φ = 84074592.

The previous prime is 126111847. The next prime is 126111929. The reversal of 126111891 is 198111621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-126111891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126111841) 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, 21018646 + ... + 21018651.

It is an arithmetic number, because the mean of its divisors is an integer number (42037298).

Almost surely, 2^126111891 is an apocalyptic number.

126111891 is a deficient number, since it is larger than the sum of its proper divisors (42037301).

126111891 is an equidigital number, since it uses as much as digits as its factorization.

126111891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42037300.

The product of its digits is 864, while the sum is 30.

The square root of 126111891 is about 11229.9550756003. The cubic root of 126111891 is about 501.4781471889.

The spelling of 126111891 in words is "one hundred twenty-six million, one hundred eleven thousand, eight hundred ninety-one".