43042039991 has 2 divisors, whose sum is σ = 43042039992. Its totient is φ = 43042039990.

The previous prime is 43042039979. The next prime is 43042040123. The reversal of 43042039991 is 19993024034.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43042039991 - 2⁶ = 43042039927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43042039921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21521019995 + 21521019996.

It is an arithmetic number, because the mean of its divisors is an integer number (21521019996).

Almost surely, 2^43042039991 is an apocalyptic number.

43042039991 is a deficient number, since it is larger than the sum of its proper divisors (1).

43042039991 is an equidigital number, since it uses as much as digits as its factorization.

43042039991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 44.

The spelling of 43042039991 in words is "forty-three billion, forty-two million, thirty-nine thousand, nine hundred ninety-one".