43913381 has 2 divisors, whose sum is σ = 43913382. Its totient is φ = 43913380.

The previous prime is 43913327. The next prime is 43913407. The reversal of 43913381 is 18331934.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43112356 + 801025 = 6566^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 43913381 - 2²² = 39719077 is a prime.

It is a super-2 number, since 2×43913381² = 3856770061702322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43913321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21956690 + 21956691.

It is an arithmetic number, because the mean of its divisors is an integer number (21956691).

Almost surely, 2^43913381 is an apocalyptic number.

It is an amenable number.

43913381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43913381 is an equidigital number, since it uses as much as digits as its factorization.

43913381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 43913381 is about 6626.7172114102. The cubic root of 43913381 is about 352.8030182853.

The spelling of 43913381 in words is "forty-three million, nine hundred thirteen thousand, three hundred eighty-one".