1791791 has 2 divisors, whose sum is σ = 1791792. Its totient is φ = 1791790.

The previous prime is 1791787. The next prime is 1791793. The reversal of 1791791 is 1971971.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1791791 - 2² = 1791787 is a prime.

Together with 1791793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1791793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895895 + 895896.

It is an arithmetic number, because the mean of its divisors is an integer number (895896).

2^1791791 is an apocalyptic number.

1791791 is the 716-th centered heptagonal number.

1791791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791791 is an equidigital number, since it uses as much as digits as its factorization.

1791791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3969, while the sum is 35.

The square root of 1791791 is about 1338.5779768097. The cubic root of 1791791 is about 121.4588366148.

The spelling of 1791791 in words is "one million, seven hundred ninety-one thousand, seven hundred ninety-one".