126521061 has 4 divisors (see below), whose sum is σ = 168694752. Its totient is φ = 84347372.

The previous prime is 126521047. The next prime is 126521063. The reversal of 126521061 is 160125621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 160125621 = 3 ⋅53375207.

It is a cyclic number.

It is not a de Polignac number, because 126521061 - 2⁵ = 126521029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126521063) 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, 21086841 + ... + 21086846.

It is an arithmetic number, because the mean of its divisors is an integer number (42173688).

Almost surely, 2^126521061 is an apocalyptic number.

It is an amenable number.

126521061 is a deficient number, since it is larger than the sum of its proper divisors (42173691).

126521061 is an equidigital number, since it uses as much as digits as its factorization.

126521061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42173690.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 126521061 is about 11248.1581158872. The cubic root of 126521061 is about 502.0199102699.

Adding to 126521061 its reverse (160125621), we get a palindrome (286646682).

The spelling of 126521061 in words is "one hundred twenty-six million, five hundred twenty-one thousand, sixty-one".