126731 has 8 divisors (see below), whose sum is σ = 142128. Its totient is φ = 112000.

The previous prime is 126719. The next prime is 126733. The reversal of 126731 is 137621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126731 - 2¹⁰ = 125707 is a prime.

It is a super-2 number, since 2×126731² = 32121492722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311 + ... + 591.

It is an arithmetic number, because the mean of its divisors is an integer number (17766).

2¹²⁶⁷³¹ is an apocalyptic number.

126731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126731 is a deficient number, since it is larger than the sum of its proper divisors (15397).

126731 is a wasteful number, since it uses less digits than its factorization.

126731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333.

The product of its digits is 252, while the sum is 20.

The square root of 126731 is about 355.9929774588. The cubic root of 126731 is about 50.2297427486.

The spelling of 126731 in words is "one hundred twenty-six thousand, seven hundred thirty-one".