1791318961 has 2 divisors, whose sum is σ = 1791318962. Its totient is φ = 1791318960.

The previous prime is 1791318953. The next prime is 1791318989. The reversal of 1791318961 is 1698131971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1694886561 + 96432400 = 41169^2 + 9820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1791318961 - 2³ = 1791318953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1791388961) 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 as a sum of consecutive naturals, namely, 895659480 + 895659481.

It is an arithmetic number, because the mean of its divisors is an integer number (895659481).

Almost surely, 2^1791318961 is an apocalyptic number.

It is an amenable number.

1791318961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791318961 is an equidigital number, since it uses as much as digits as its factorization.

1791318961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 46.

The square root of 1791318961 is about 42323.9761955325. The cubic root of 1791318961 is about 1214.4816975632.

The spelling of 1791318961 in words is "one billion, seven hundred ninety-one million, three hundred eighteen thousand, nine hundred sixty-one".