43964981 has 2 divisors, whose sum is σ = 43964982. Its totient is φ = 43964980.

The previous prime is 43964969. The next prime is 43965059. The reversal of 43964981 is 18946934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 15171025 = 5366^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 43964981 - 2¹⁰ = 43963957 is a prime.

It is a super-2 number, since 2×43964981² = 3865839108660722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43964951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21982490 + 21982491.

It is an arithmetic number, because the mean of its divisors is an integer number (21982491).

Almost surely, 2^43964981 is an apocalyptic number.

It is an amenable number.

43964981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43964981 is an equidigital number, since it uses as much as digits as its factorization.

43964981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 43964981 is about 6630.6093988411. The cubic root of 43964981 is about 352.9411501378.

The spelling of 43964981 in words is "forty-three million, nine hundred sixty-four thousand, nine hundred eighty-one".