1791271731481 has 2 divisors, whose sum is σ = 1791271731482. Its totient is φ = 1791271731480.

The previous prime is 1791271731437. The next prime is 1791271731497. The reversal of 1791271731481 is 1841371721971.

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., 1791271731456 + 25 = 1338384^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 1791271731481 - 2²³ = 1791263342873 is a prime.

It is a super-4 number, since 4×1791271731481⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1791271731281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895635865740 + 895635865741.

It is an arithmetic number, because the mean of its divisors is an integer number (895635865741).

Almost surely, 2^{1791271731481} is an apocalyptic number.

It is an amenable number.

1791271731481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791271731481 is an equidigital number, since it uses as much as digits as its factorization.

1791271731481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 52.

The spelling of 1791271731481 in words is "one trillion, seven hundred ninety-one billion, two hundred seventy-one million, seven hundred thirty-one thousand, four hundred eighty-one".