521497 has 2 divisors, whose sum is σ = 521498. Its totient is φ = 521496.

The previous prime is 521491. The next prime is 521503. The reversal of 521497 is 794125.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (521491) and next prime (521503).

It can be written as a sum of positive squares in only one way, i.e., 318096 + 203401 = 564^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 521497 - 2⁷ = 521369 is a prime.

521497 is a lucky number.

It is a nialpdrome in base 9.

It is not a weakly prime, because it can be changed into another prime (521491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260748 + 260749.

It is an arithmetic number, because the mean of its divisors is an integer number (260749).

2⁵²¹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

521497 is a deficient number, since it is larger than the sum of its proper divisors (1).

521497 is an equidigital number, since it uses as much as digits as its factorization.

521497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 521497 is about 722.1474918602. The cubic root of 521497 is about 80.4916082452.

The spelling of 521497 in words is "five hundred twenty-one thousand, four hundred ninety-seven".