2126681 has 2 divisors, whose sum is σ = 2126682. Its totient is φ = 2126680.

The previous prime is 2126659. The next prime is 2126687. The reversal of 2126681 is 1866212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478656 + 648025 = 1216^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126681 - 2⁶ = 2126617 is a prime.

It is a super-2 number, since 2×2126681² = 9045544151522, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2126681.

It is not a weakly prime, because it can be changed into another prime (2126687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063340 + 1063341.

It is an arithmetic number, because the mean of its divisors is an integer number (1063341).

2^2126681 is an apocalyptic number.

It is an amenable number.

2126681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126681 is an equidigital number, since it uses as much as digits as its factorization.

2126681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 2126681 is about 1458.3144379728. The cubic root of 2126681 is about 128.5979711809.

The spelling of 2126681 in words is "two million, one hundred twenty-six thousand, six hundred eighty-one".