43078913 has 2 divisors, whose sum is σ = 43078914. Its totient is φ = 43078912.

The previous prime is 43078907. The next prime is 43078927. The reversal of 43078913 is 31987034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36566209 + 6512704 = 6047^2 + 2552^2 .

It is a cyclic number.

It is not a de Polignac number, because 43078913 - 2¹⁸ = 42816769 is a prime.

It is equal to p_2608991 and since 43078913 and 2608991 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 (43078943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21539456 + 21539457.

It is an arithmetic number, because the mean of its divisors is an integer number (21539457).

Almost surely, 2^43078913 is an apocalyptic number.

It is an amenable number.

43078913 is a deficient number, since it is larger than the sum of its proper divisors (1).

43078913 is an equidigital number, since it uses as much as digits as its factorization.

43078913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 43078913 is about 6563.4528260665. The cubic root of 43078913 is about 350.5539879787.

The spelling of 43078913 in words is "forty-three million, seventy-eight thousand, nine hundred thirteen".