1042991791 has 2 divisors, whose sum is σ = 1042991792. Its totient is φ = 1042991790.

The previous prime is 1042991773. The next prime is 1042991797. The reversal of 1042991791 is 1971992401.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1042991791 - 2⁵ = 1042991759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1042991797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521495895 + 521495896.

It is an arithmetic number, because the mean of its divisors is an integer number (521495896).

Almost surely, 2^1042991791 is an apocalyptic number.

1042991791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042991791 is an equidigital number, since it uses as much as digits as its factorization.

1042991791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1042991791 is about 32295.3834316919. The cubic root of 1042991791 is about 1014.1299997239.

The spelling of 1042991791 in words is "one billion, forty-two million, nine hundred ninety-one thousand, seven hundred ninety-one".