43019381 has 2 divisors, whose sum is σ = 43019382. Its totient is φ = 43019380.

The previous prime is 43019359. The next prime is 43019399. The reversal of 43019381 is 18391034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 9205156 = 5815^2 + 3034^2 .

It is a cyclic number.

It is not a de Polignac number, because 43019381 - 2²² = 38825077 is a prime.

It is a super-2 number, since 2×43019381² = 3701334283246322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43019311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21509690 + 21509691.

It is an arithmetic number, because the mean of its divisors is an integer number (21509691).

Almost surely, 2^43019381 is an apocalyptic number.

It is an amenable number.

43019381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43019381 is an equidigital number, since it uses as much as digits as its factorization.

43019381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 43019381 is about 6558.9161452179. The cubic root of 43019381 is about 350.3924332938.

The spelling of 43019381 in words is "forty-three million, nineteen thousand, three hundred eighty-one".