126065991 has 4 divisors (see below), whose sum is σ = 168087992. Its totient is φ = 84043992.

The previous prime is 126065983. The next prime is 126066019. The reversal of 126065991 is 199560621.

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

It is not a de Polignac number, because 126065991 - 2³ = 126065983 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 (126065491) 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, 21010996 + ... + 21011001.

It is an arithmetic number, because the mean of its divisors is an integer number (42021998).

Almost surely, 2^126065991 is an apocalyptic number.

126065991 is a deficient number, since it is larger than the sum of its proper divisors (42022001).

126065991 is an equidigital number, since it uses as much as digits as its factorization.

126065991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42022000.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 126065991 is about 11227.9112483133. The cubic root of 126065991 is about 501.4173000584.

The spelling of 126065991 in words is "one hundred twenty-six million, sixty-five thousand, nine hundred ninety-one".