42993791 has 2 divisors, whose sum is σ = 42993792. Its totient is φ = 42993790.

The previous prime is 42993773. The next prime is 42993803. The reversal of 42993791 is 19739924.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42993791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42993701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21496895 + 21496896.

It is an arithmetic number, because the mean of its divisors is an integer number (21496896).

Almost surely, 2^42993791 is an apocalyptic number.

42993791 is a deficient number, since it is larger than the sum of its proper divisors (1).

42993791 is an equidigital number, since it uses as much as digits as its factorization.

42993791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 42993791 is about 6556.9650753988. The cubic root of 42993791 is about 350.3229427475.

The spelling of 42993791 in words is "forty-two million, nine hundred ninety-three thousand, seven hundred ninety-one".