43313993 has 2 divisors, whose sum is σ = 43313994. Its totient is φ = 43313992.

The previous prime is 43313989. The next prime is 43314043. The reversal of 43313993 is 39931334.

43313993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39790864 + 3523129 = 6308^2 + 1877^2 .

It is a cyclic number.

It is not a de Polignac number, because 43313993 - 2² = 43313989 is a prime.

It is a super-2 number, since 2×43313993² = 3752203979208098, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43313923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21656996 + 21656997.

It is an arithmetic number, because the mean of its divisors is an integer number (21656997).

Almost surely, 2^43313993 is an apocalyptic number.

It is an amenable number.

43313993 is a deficient number, since it is larger than the sum of its proper divisors (1).

43313993 is an equidigital number, since it uses as much as digits as its factorization.

43313993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 35.

The square root of 43313993 is about 6581.3367183271. The cubic root of 43313993 is about 351.1904848865.

The spelling of 43313993 in words is "forty-three million, three hundred thirteen thousand, nine hundred ninety-three".