43128331 has 2 divisors, whose sum is σ = 43128332. Its totient is φ = 43128330.

The previous prime is 43128329. The next prime is 43128341. The reversal of 43128331 is 13382134.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43128331 - 2¹ = 43128329 is a prime.

It is a super-2 number, since 2×43128331² = 3720105869691122, which contains 22 as substring.

Together with 43128329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 43128296 and 43128305.

It is not a weakly prime, because it can be changed into another prime (43128301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21564165 + 21564166.

It is an arithmetic number, because the mean of its divisors is an integer number (21564166).

Almost surely, 2^43128331 is an apocalyptic number.

43128331 is a deficient number, since it is larger than the sum of its proper divisors (1).

43128331 is an equidigital number, since it uses as much as digits as its factorization.

43128331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 43128331 is about 6567.2163813902. The cubic root of 43128331 is about 350.6879828244.

The spelling of 43128331 in words is "forty-three million, one hundred twenty-eight thousand, three hundred thirty-one".