1791681131 has 2 divisors, whose sum is σ = 1791681132. Its totient is φ = 1791681130.

The previous prime is 1791681127. The next prime is 1791681169. The reversal of 1791681131 is 1311861971.

It is an a-pointer prime, because the next prime (1791681169) can be obtained adding 1791681131 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1791681131 - 2² = 1791681127 is a prime.

It is a super-2 number, since 2×1791681131² = 6420242550362878322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1791681191) 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, 895840565 + 895840566.

It is an arithmetic number, because the mean of its divisors is an integer number (895840566).

Almost surely, 2^1791681131 is an apocalyptic number.

1791681131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791681131 is an equidigital number, since it uses as much as digits as its factorization.

1791681131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 38.

The square root of 1791681131 is about 42328.2545234268. The cubic root of 1791681131 is about 1214.5635402736.

The spelling of 1791681131 in words is "one billion, seven hundred ninety-one million, six hundred eighty-one thousand, one hundred thirty-one".