523136681 has 2 divisors, whose sum is σ = 523136682. Its totient is φ = 523136680.

The previous prime is 523136623. The next prime is 523136683. The reversal of 523136681 is 186631325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404653456 + 118483225 = 20116^2 + 10885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523136681 is a prime.

It is a super-2 number, since 2×523136681² = 547343974015391522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 523136683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (523136683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261568340 + 261568341.

It is an arithmetic number, because the mean of its divisors is an integer number (261568341).

Almost surely, 2^523136681 is an apocalyptic number.

It is an amenable number.

523136681 is a deficient number, since it is larger than the sum of its proper divisors (1).

523136681 is an equidigital number, since it uses as much as digits as its factorization.

523136681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 523136681 is about 22872.1813782595. The cubic root of 523136681 is about 805.7588004880.

The spelling of 523136681 in words is "five hundred twenty-three million, one hundred thirty-six thousand, six hundred eighty-one".