521693 has 2 divisors, whose sum is σ = 521694. Its totient is φ = 521692.

The previous prime is 521671. The next prime is 521707. The reversal of 521693 is 396125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375769 + 145924 = 613^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 521693 - 2¹² = 517597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260846 + 260847.

It is an arithmetic number, because the mean of its divisors is an integer number (260847).

2⁵²¹⁶⁹³ is an apocalyptic number.

It is an amenable number.

521693 is a deficient number, since it is larger than the sum of its proper divisors (1).

521693 is an equidigital number, since it uses as much as digits as its factorization.

521693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 521693 is about 722.2831854612. The cubic root of 521693 is about 80.5016910001.

The spelling of 521693 in words is "five hundred twenty-one thousand, six hundred ninety-three".