43423440251 has 2 divisors, whose sum is σ = 43423440252. Its totient is φ = 43423440250.

The previous prime is 43423440223. The next prime is 43423440253. The reversal of 43423440251 is 15204432434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43423440251 - 2²⁶ = 43356331387 is a prime.

It is a Sophie Germain prime.

Together with 43423440253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43423440253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21711720125 + 21711720126.

It is an arithmetic number, because the mean of its divisors is an integer number (21711720126).

Almost surely, 2^43423440251 is an apocalyptic number.

43423440251 is a deficient number, since it is larger than the sum of its proper divisors (1).

43423440251 is an equidigital number, since it uses as much as digits as its factorization.

43423440251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 43423440251 its reverse (15204432434), we get a palindrome (58627872685).

The spelling of 43423440251 in words is "forty-three billion, four hundred twenty-three million, four hundred forty thousand, two hundred fifty-one".