1043997791 has 4 divisors (see below), whose sum is σ = 1044136032. Its totient is φ = 1043859552.

The previous prime is 1043997751. The next prime is 1043997797. The reversal of 1043997791 is 1977993401.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1043997791 is a prime.

It is a super-2 number, since 2×1043997791² = 2179862775225759362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043997797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57095 + ... + 73128.

It is an arithmetic number, because the mean of its divisors is an integer number (261034008).

Almost surely, 2^1043997791 is an apocalyptic number.

1043997791 is a deficient number, since it is larger than the sum of its proper divisors (138241).

1043997791 is an equidigital number, since it uses as much as digits as its factorization.

1043997791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138240.

The product of its (nonzero) digits is 428652, while the sum is 50.

The square root of 1043997791 is about 32310.9546593721. The cubic root of 1043997791 is about 1014.4559489000.

The spelling of 1043997791 in words is "one billion, forty-three million, nine hundred ninety-seven thousand, seven hundred ninety-one".