43550231 has 2 divisors, whose sum is σ = 43550232. Its totient is φ = 43550230.

The previous prime is 43550203. The next prime is 43550233. The reversal of 43550231 is 13205534.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43550231 is a prime.

It is a super-2 number, since 2×43550231² = 3793245240306722, which contains 22 as substring.

Together with 43550233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43550197 and 43550206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43550233) 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, 21775115 + 21775116.

It is an arithmetic number, because the mean of its divisors is an integer number (21775116).

Almost surely, 2^43550231 is an apocalyptic number.

43550231 is a deficient number, since it is larger than the sum of its proper divisors (1).

43550231 is an equidigital number, since it uses as much as digits as its factorization.

43550231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 43550231 is about 6599.2598827444. The cubic root of 43550231 is about 351.8278013413.

Adding to 43550231 its reverse (13205534), we get a palindrome (56755765).

The spelling of 43550231 in words is "forty-three million, five hundred fifty thousand, two hundred thirty-one".