126406165 has 4 divisors (see below), whose sum is σ = 151687404. Its totient is φ = 101124928.

The previous prime is 126406151. The next prime is 126406249. The reversal of 126406165 is 561604621.

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 26286129 + 100120036 = 5127^2 + 10006^2 .

It is a cyclic number.

It is not a de Polignac number, because 126406165 - 2⁷ = 126406037 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 12640612 + ... + 12640621.

It is an arithmetic number, because the mean of its divisors is an integer number (37921851).

Almost surely, 2^126406165 is an apocalyptic number.

It is an amenable number.

126406165 is a deficient number, since it is larger than the sum of its proper divisors (25281239).

126406165 is an equidigital number, since it uses as much as digits as its factorization.

126406165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25281238.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 126406165 is about 11243.0496307719. The cubic root of 126406165 is about 501.8678998772.

The spelling of 126406165 in words is "one hundred twenty-six million, four hundred six thousand, one hundred sixty-five".