521366 has 8 divisors (see below), whose sum is σ = 792984. Its totient is φ = 257040.

The previous prime is 521363. The next prime is 521369. The reversal of 521366 is 663125.

It is an interprime number because it is at equal distance from previous prime (521363) and next prime (521369).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521366.

It is not an unprimeable number, because it can be changed into a prime (521363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640 + ... + 1931.

It is an arithmetic number, because the mean of its divisors is an integer number (99123).

2⁵²¹³⁶⁶ is an apocalyptic number.

521366 is a deficient number, since it is larger than the sum of its proper divisors (271618).

521366 is a wasteful number, since it uses less digits than its factorization.

521366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646.

The product of its digits is 1080, while the sum is 23.

The square root of 521366 is about 722.0567844706. The cubic root of 521366 is about 80.4848678525.

The spelling of 521366 in words is "five hundred twenty-one thousand, three hundred sixty-six".