43421951 has 2 divisors, whose sum is σ = 43421952. Its totient is φ = 43421950.

The previous prime is 43421947. The next prime is 43421969. The reversal of 43421951 is 15912434.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43421951 - 2² = 43421947 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43421971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710975 + 21710976.

It is an arithmetic number, because the mean of its divisors is an integer number (21710976).

Almost surely, 2^43421951 is an apocalyptic number.

43421951 is a deficient number, since it is larger than the sum of its proper divisors (1).

43421951 is an equidigital number, since it uses as much as digits as its factorization.

43421951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 43421951 is about 6589.5334432720. The cubic root of 43421951 is about 351.4820178211.

The spelling of 43421951 in words is "forty-three million, four hundred twenty-one thousand, nine hundred fifty-one".