1791291121 has 2 divisors, whose sum is σ = 1791291122. Its totient is φ = 1791291120.

The previous prime is 1791291049. The next prime is 1791291149. The reversal of 1791291121 is 1211921971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218359025 + 572932096 = 34905^2 + 23936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1791291121 - 2⁷ = 1791290993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1791291181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895645560 + 895645561.

It is an arithmetic number, because the mean of its divisors is an integer number (895645561).

Almost surely, 2^1791291121 is an apocalyptic number.

It is an amenable number.

1791291121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791291121 is an equidigital number, since it uses as much as digits as its factorization.

1791291121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 34.

The square root of 1791291121 is about 42323.6473026605. The cubic root of 1791291121 is about 1214.4754058593.

The spelling of 1791291121 in words is "one billion, seven hundred ninety-one million, two hundred ninety-one thousand, one hundred twenty-one".