126731661 has 16 divisors (see below), whose sum is σ = 193340544. Its totient is φ = 72333504.

The previous prime is 126731611. The next prime is 126731677. The reversal of 126731661 is 166137621.

It is not a de Polignac number, because 126731661 - 2¹³ = 126723469 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 (126731611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17911 + ... + 23963.

It is an arithmetic number, because the mean of its divisors is an integer number (12083784).

Almost surely, 2^126731661 is an apocalyptic number.

It is an amenable number.

126731661 is a deficient number, since it is larger than the sum of its proper divisors (66608883).

126731661 is an equidigital number, since it uses as much as digits as its factorization.

126731661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060.

The product of its digits is 9072, while the sum is 33.

The square root of 126731661 is about 11257.5157561515. The cubic root of 126731661 is about 502.2983007737.

The spelling of 126731661 in words is "one hundred twenty-six million, seven hundred thirty-one thousand, six hundred sixty-one".