43809481 has 2 divisors, whose sum is σ = 43809482. Its totient is φ = 43809480.

The previous prime is 43809439. The next prime is 43809533. The reversal of 43809481 is 18490834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43771456 + 38025 = 6616^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 43809481 - 2⁹ = 43808969 is a prime.

It is a super-2 number, since 2×43809481² = 3838541250978722, which contains 22 as substring.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 43809481 parts by 9360 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 43809481.

It is not a weakly prime, because it can be changed into another prime (43809431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21904740 + 21904741.

It is an arithmetic number, because the mean of its divisors is an integer number (21904741).

Almost surely, 2^43809481 is an apocalyptic number.

It is an amenable number.

43809481 is a deficient number, since it is larger than the sum of its proper divisors (1).

43809481 is an equidigital number, since it uses as much as digits as its factorization.

43809481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 43809481 is about 6618.8730913955. The cubic root of 43809481 is about 352.5245520514.

It can be divided in two parts, 4380 and 9481, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 43809481 in words is "forty-three million, eight hundred nine thousand, four hundred eighty-one".