520981 has 2 divisors, whose sum is σ = 520982. Its totient is φ = 520980.

The previous prime is 520969. The next prime is 521009. The reversal of 520981 is 189025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401956 + 119025 = 634^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 520981 - 2⁷ = 520853 is a prime.

It is a super-2 number, since 2×520981² = 542842404722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260490 + 260491.

It is an arithmetic number, because the mean of its divisors is an integer number (260491).

2⁵²⁰⁹⁸¹ is an apocalyptic number.

520981 is the 457-th centered pentagonal number.

It is an amenable number.

520981 is a deficient number, since it is larger than the sum of its proper divisors (1).

520981 is an equidigital number, since it uses as much as digits as its factorization.

520981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 520981 is about 721.7901357043. The cubic root of 520981 is about 80.4650517639.

The spelling of 520981 in words is "five hundred twenty thousand, nine hundred eighty-one".