126205913 has 4 divisors (see below), whose sum is σ = 129284148. Its totient is φ = 123127680.

The previous prime is 126205901. The next prime is 126205921. The reversal of 126205913 is 319502621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 71859529 + 54346384 = 8477^2 + 7372^2 .

It is a cyclic number.

It is not a de Polignac number, because 126205913 - 2¹⁴ = 126189529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126205213) 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, 1539056 + ... + 1539137.

It is an arithmetic number, because the mean of its divisors is an integer number (32321037).

Almost surely, 2^126205913 is an apocalyptic number.

It is an amenable number.

126205913 is a deficient number, since it is larger than the sum of its proper divisors (3078235).

126205913 is an equidigital number, since it uses as much as digits as its factorization.

126205913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078234.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 126205913 is about 11234.1405100702. The cubic root of 126205913 is about 501.6027409534.

The spelling of 126205913 in words is "one hundred twenty-six million, two hundred five thousand, nine hundred thirteen".