2126731 has 4 divisors (see below), whose sum is σ = 2166912. Its totient is φ = 2086552.

The previous prime is 2126687. The next prime is 2126749. The reversal of 2126731 is 1376212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126731 is a prime.

It is a super-2 number, since 2×2126731² = 9045969492722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) 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 not an unprimeable number, because it can be changed into a prime (2126771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20011 + ... + 20116.

It is an arithmetic number, because the mean of its divisors is an integer number (541728).

2^2126731 is an apocalyptic number.

2126731 is a deficient number, since it is larger than the sum of its proper divisors (40181).

2126731 is an equidigital number, since it uses as much as digits as its factorization.

2126731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40180.

The product of its digits is 504, while the sum is 22.

The square root of 2126731 is about 1458.3315809513. The cubic root of 2126731 is about 128.5989789873.

The spelling of 2126731 in words is "two million, one hundred twenty-six thousand, seven hundred thirty-one".