126721137 has 16 divisors (see below), whose sum is σ = 172005120. Its totient is φ = 82972032.

The previous prime is 126721123. The next prime is 126721139. The reversal of 126721137 is 731127621.

It is a de Polignac number, because none of the positive numbers 2^k-126721137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126721139) 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, 40408 + ... + 43430.

It is an arithmetic number, because the mean of its divisors is an integer number (10750320).

Almost surely, 2^126721137 is an apocalyptic number.

It is an amenable number.

126721137 is a deficient number, since it is larger than the sum of its proper divisors (45283983).

126721137 is a wasteful number, since it uses less digits than its factorization.

126721137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272.

The product of its digits is 3528, while the sum is 30.

The square root of 126721137 is about 11257.0483253826. The cubic root of 126721137 is about 502.2843965038.

Adding to 126721137 its reverse (731127621), we get a palindrome (857848758).

The spelling of 126721137 in words is "one hundred twenty-six million, seven hundred twenty-one thousand, one hundred thirty-seven".