1801531791317 has 2 divisors, whose sum is σ = 1801531791318. Its totient is φ = 1801531791316.

The previous prime is 1801531791217. The next prime is 1801531791341. The reversal of 1801531791317 is 7131971351081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 944927861476 + 856603929841 = 972074^2 + 925529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801531791317 - 2⁸ = 1801531791061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801531791217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900765895658 + 900765895659.

It is an arithmetic number, because the mean of its divisors is an integer number (900765895659).

Almost surely, 2^{1801531791317} is an apocalyptic number.

It is an amenable number.

1801531791317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801531791317 is an equidigital number, since it uses as much as digits as its factorization.

1801531791317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 47.

The spelling of 1801531791317 in words is "one trillion, eight hundred one billion, five hundred thirty-one million, seven hundred ninety-one thousand, three hundred seventeen".