126125661 has 4 divisors (see below), whose sum is σ = 168167552. Its totient is φ = 84083772.

The previous prime is 126125641. The next prime is 126125683. The reversal of 126125661 is 166521621.

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.

It is not a de Polignac number, because 126125661 - 2²⁵ = 92571229 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 (126125641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21020941 + ... + 21020946.

It is an arithmetic number, because the mean of its divisors is an integer number (42041888).

Almost surely, 2^126125661 is an apocalyptic number.

It is an amenable number.

126125661 is a deficient number, since it is larger than the sum of its proper divisors (42041891).

126125661 is an equidigital number, since it uses as much as digits as its factorization.

126125661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42041890.

The product of its digits is 4320, while the sum is 30.

The square root of 126125661 is about 11230.5681512558. The cubic root of 126125661 is about 501.4963984490.

The spelling of 126125661 in words is "one hundred twenty-six million, one hundred twenty-five thousand, six hundred sixty-one".