522731981 has 2 divisors, whose sum is σ = 522731982. Its totient is φ = 522731980.

The previous prime is 522731969. The next prime is 522731983. The reversal of 522731981 is 189137225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429898756 + 92833225 = 20734^2 + 9635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-522731981 is a prime.

It is a super-2 number, since 2×522731981² = 546497447920368722, which contains 22 as substring.

Together with 522731983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (522731983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261365990 + 261365991.

It is an arithmetic number, because the mean of its divisors is an integer number (261365991).

Almost surely, 2^522731981 is an apocalyptic number.

It is an amenable number.

522731981 is a deficient number, since it is larger than the sum of its proper divisors (1).

522731981 is an equidigital number, since it uses as much as digits as its factorization.

522731981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 522731981 is about 22863.3326748311. The cubic root of 522731981 is about 805.5509677981.

The spelling of 522731981 in words is "five hundred twenty-two million, seven hundred thirty-one thousand, nine hundred eighty-one".