43120081 has 2 divisors, whose sum is σ = 43120082. Its totient is φ = 43120080.

The previous prime is 43120079. The next prime is 43120093. The reversal of 43120081 is 18002134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33872400 + 9247681 = 5820^2 + 3041^2 .

It is a cyclic number.

It is not a de Polignac number, because 43120081 - 2¹ = 43120079 is a prime.

It is a super-2 number, since 2×43120081² = 3718682770893122, which contains 22 as substring.

Together with 43120079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43120001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560040 + 21560041.

It is an arithmetic number, because the mean of its divisors is an integer number (21560041).

Almost surely, 2^43120081 is an apocalyptic number.

It is an amenable number.

43120081 is a deficient number, since it is larger than the sum of its proper divisors (1).

43120081 is an equidigital number, since it uses as much as digits as its factorization.

43120081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 43120081 is about 6566.5882313421. The cubic root of 43120081 is about 350.6656204137.

The spelling of 43120081 in words is "forty-three million, one hundred twenty thousand, eighty-one".