523157081 has 2 divisors, whose sum is σ = 523157082. Its totient is φ = 523157080.

The previous prime is 523157027. The next prime is 523157119. The reversal of 523157081 is 180751325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286151056 + 237006025 = 16916^2 + 15395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523157081 is a prime.

It is a super-2 number, since 2×523157081² = 547386662800881122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (523157021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261578540 + 261578541.

It is an arithmetic number, because the mean of its divisors is an integer number (261578541).

Almost surely, 2^523157081 is an apocalyptic number.

It is an amenable number.

523157081 is a deficient number, since it is larger than the sum of its proper divisors (1).

523157081 is an equidigital number, since it uses as much as digits as its factorization.

523157081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 523157081 is about 22872.6273305014. The cubic root of 523157081 is about 805.7692740198.

The spelling of 523157081 in words is "five hundred twenty-three million, one hundred fifty-seven thousand, eighty-one".