711511681 has 2 divisors, whose sum is σ = 711511682. Its totient is φ = 711511680.

The previous prime is 711511679. The next prime is 711511699. The reversal of 711511681 is 186115117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682254400 + 29257281 = 26120^2 + 5409^2 .

It is a cyclic number.

It is not a de Polignac number, because 711511681 - 2¹ = 711511679 is a prime.

It is a super-2 number, since 2×711511681² = 1012497744398891522, which contains 22 as substring.

Together with 711511679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (711511631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 355755840 + 355755841.

It is an arithmetic number, because the mean of its divisors is an integer number (355755841).

Almost surely, 2^711511681 is an apocalyptic number.

It is an amenable number.

711511681 is a deficient number, since it is larger than the sum of its proper divisors (1).

711511681 is an equidigital number, since it uses as much as digits as its factorization.

711511681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 31.

The square root of 711511681 is about 26674.1762946862. The cubic root of 711511681 is about 892.7448319934.

Adding to 711511681 its reverse (186115117), we get a palindrome (897626798).

The spelling of 711511681 in words is "seven hundred eleven million, five hundred eleven thousand, six hundred eighty-one".