521266 has 8 divisors (see below), whose sum is σ = 785664. Its totient is φ = 259380.

The previous prime is 521251. The next prime is 521267. The reversal of 521266 is 662125.

521266 = T₅₈₈ + T₅₈₉ + T₅₉₀.

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

It is not an unprimeable number, because it can be changed into a prime (521267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (98208).

2⁵²¹²⁶⁶ is an apocalyptic number.

521266 is the 590-th centered triangular number.

521266 is a deficient number, since it is larger than the sum of its proper divisors (264398).

521266 is a wasteful number, since it uses less digits than its factorization.

521266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its digits is 720, while the sum is 22.

The square root of 521266 is about 721.9875345184. The cubic root of 521266 is about 80.4797217547.

It can be divided in two parts, 521 and 266, that added together give a palindrome (787).

The spelling of 521266 in words is "five hundred twenty-one thousand, two hundred sixty-six".