126006991 has 8 divisors (see below), whose sum is σ = 137707344. Its totient is φ = 114347520.

The previous prime is 126006961. The next prime is 126006997. The reversal of 126006991 is 199600621.

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

It is a cyclic number.

It is not a de Polignac number, because 126006991 - 2¹³ = 125998799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126006997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3580 + ... + 16273.

It is an arithmetic number, because the mean of its divisors is an integer number (17213418).

Almost surely, 2^126006991 is an apocalyptic number.

126006991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126006991 is a deficient number, since it is larger than the sum of its proper divisors (11700353).

126006991 is a wasteful number, since it uses less digits than its factorization.

126006991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20441.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 126006991 is about 11225.2835598928. The cubic root of 126006991 is about 501.3390652736.

It can be divided in two parts, 12600 and 6991, that added together give a palindrome (19591).

The spelling of 126006991 in words is "one hundred twenty-six million, six thousand, nine hundred ninety-one".