2356681 has 2 divisors, whose sum is σ = 2356682. Its totient is φ = 2356680.

The previous prime is 2356663. The next prime is 2356687. The reversal of 2356681 is 1866532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 1166400 = 1091^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 2356681 - 2⁷ = 2356553 is a prime.

It is a super-2 number, since 2×2356681² = 11107890671522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2356687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1178340 + 1178341.

It is an arithmetic number, because the mean of its divisors is an integer number (1178341).

2^2356681 is an apocalyptic number.

It is an amenable number.

2356681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2356681 is an equidigital number, since it uses as much as digits as its factorization.

2356681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 2356681 is about 1535.1485270162. The cubic root of 2356681 is about 133.0761619293.

The spelling of 2356681 in words is "two million, three hundred fifty-six thousand, six hundred eighty-one".