126301661 has 4 divisors (see below), whose sum is σ = 126325500. Its totient is φ = 126277824.

The previous prime is 126301649. The next prime is 126301667. The reversal of 126301661 is 166103621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166103621 = 823 ⋅201827.

It can be written as a sum of positive squares in 2 ways, for example, as 43309561 + 82992100 = 6581^2 + 9110^2 .

It is a cyclic number.

It is not a de Polignac number, because 126301661 - 2¹⁴ = 126285277 is a prime.

It is a super-3 number, since 3×126301661³ (a number of 25 digits) contains 333 as substring.

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 126301661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126301667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 15893.

It is an arithmetic number, because the mean of its divisors is an integer number (31581375).

Almost surely, 2^126301661 is an apocalyptic number.

It is an amenable number.

126301661 is a deficient number, since it is larger than the sum of its proper divisors (23839).

126301661 is an equidigital number, since it uses as much as digits as its factorization.

126301661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23838.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 126301661 is about 11238.4011763240. The cubic root of 126301661 is about 501.7295583574.

The spelling of 126301661 in words is "one hundred twenty-six million, three hundred one thousand, six hundred sixty-one".