126436591 has 4 divisors (see below), whose sum is σ = 128509384. Its totient is φ = 124363800.

The previous prime is 126436573. The next prime is 126436601. The reversal of 126436591 is 195634621.

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

It is a cyclic number.

It is not a de Polignac number, because 126436591 - 2⁵ = 126436559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126436591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126436691) 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, 1036305 + ... + 1036426.

It is an arithmetic number, because the mean of its divisors is an integer number (32127346).

Almost surely, 2^126436591 is an apocalyptic number.

126436591 is a deficient number, since it is larger than the sum of its proper divisors (2072793).

126436591 is an equidigital number, since it uses as much as digits as its factorization.

126436591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072792.

The product of its digits is 38880, while the sum is 37.

The square root of 126436591 is about 11244.4026519865. The cubic root of 126436591 is about 501.9081632291.

The spelling of 126436591 in words is "one hundred twenty-six million, four hundred thirty-six thousand, five hundred ninety-one".