43741681 has 2 divisors, whose sum is σ = 43741682. Its totient is φ = 43741680.

The previous prime is 43741679. The next prime is 43741739. The reversal of 43741681 is 18614734.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43362225 + 379456 = 6585^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 43741681 - 2¹ = 43741679 is a prime.

It is a super-2 number, since 2×43741681² = 3826669313411522, which contains 22 as substring.

Together with 43741679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43741601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21870840 + 21870841.

It is an arithmetic number, because the mean of its divisors is an integer number (21870841).

Almost surely, 2^43741681 is an apocalyptic number.

It is an amenable number.

43741681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43741681 is an equidigital number, since it uses as much as digits as its factorization.

43741681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 43741681 is about 6613.7493904744. The cubic root of 43741681 is about 352.3426012911.

It can be divided in two parts, 43741 and 681, that multiplied together give a triangular number (29787621 = T₇₇₁₈).

The spelling of 43741681 in words is "forty-three million, seven hundred forty-one thousand, six hundred eighty-one".