1801531791061 has 2 divisors, whose sum is σ = 1801531791062. Its totient is φ = 1801531791060.

The previous prime is 1801531791047. The next prime is 1801531791109. The reversal of 1801531791061 is 1601971351081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1477121806161 + 324409984900 = 1215369^2 + 569570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1801531791061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1801531790999 and 1801531791017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801531791041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900765895530 + 900765895531.

It is an arithmetic number, because the mean of its divisors is an integer number (900765895531).

Almost surely, 2^{1801531791061} is an apocalyptic number.

It is an amenable number.

1801531791061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801531791061 is an equidigital number, since it uses as much as digits as its factorization.

1801531791061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 43.

The spelling of 1801531791061 in words is "one trillion, eight hundred one billion, five hundred thirty-one million, seven hundred ninety-one thousand, sixty-one".