1491161261833 has 2 divisors, whose sum is σ = 1491161261834. Its totient is φ = 1491161261832.

The previous prime is 1491161261809. The next prime is 1491161261867. The reversal of 1491161261833 is 3381621611941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1318278274569 + 172882987264 = 1148163^2 + 415792^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491161261833 - 2⁵ = 1491161261801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491161261333) 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, 745580630916 + 745580630917.

It is an arithmetic number, because the mean of its divisors is an integer number (745580630917).

Almost surely, 2^{1491161261833} is an apocalyptic number.

It is an amenable number.

1491161261833 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491161261833 is an equidigital number, since it uses as much as digits as its factorization.

1491161261833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The spelling of 1491161261833 in words is "one trillion, four hundred ninety-one billion, one hundred sixty-one million, two hundred sixty-one thousand, eight hundred thirty-three".