126991222 has 8 divisors (see below), whose sum is σ = 190546272. Its totient is φ = 63475800.

The previous prime is 126991171. The next prime is 126991223. The reversal of 126991222 is 222199621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×126991222² = 32253540930106568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126991223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147 + ... + 15937.

It is an arithmetic number, because the mean of its divisors is an integer number (23818284).

Almost surely, 2^126991222 is an apocalyptic number.

126991222 is a deficient number, since it is larger than the sum of its proper divisors (63555050).

126991222 is a wasteful number, since it uses less digits than its factorization.

126991222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19814.

The product of its digits is 7776, while the sum is 34.

The square root of 126991222 is about 11269.0382020827. The cubic root of 126991222 is about 502.6409884660.

The spelling of 126991222 in words is "one hundred twenty-six million, nine hundred ninety-one thousand, two hundred twenty-two".