115721443 has 2 divisors, whose sum is σ = 115721444. Its totient is φ = 115721442.

The previous prime is 115721429. The next prime is 115721447. The reversal of 115721443 is 344127511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115721443 is a prime.

It is equal to p_6611518 and since 115721443 and 6611518 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (115721447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57860721 + 57860722.

It is an arithmetic number, because the mean of its divisors is an integer number (57860722).

Almost surely, 2^115721443 is an apocalyptic number.

115721443 is a deficient number, since it is larger than the sum of its proper divisors (1).

115721443 is an equidigital number, since it uses as much as digits as its factorization.

115721443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 115721443 is about 10757.3901574685. The cubic root of 115721443 is about 487.3092032673.

Adding to 115721443 its reverse (344127511), we get a palindrome (459848954).

The spelling of 115721443 in words is "one hundred fifteen million, seven hundred twenty-one thousand, four hundred forty-three".