521612 has 24 divisors (see below), whose sum is σ = 1124256. Its totient is φ = 206208.

The previous prime is 521603. The next prime is 521641. The reversal of 521612 is 216125.

521612 is nontrivially palindromic in base 3.

It is an alternating number because its digits alternate between odd and even.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353 + ... + 1080.

It is an arithmetic number, because the mean of its divisors is an integer number (46844).

2⁵²¹⁶¹² is an apocalyptic number.

521612 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

521612 is an abundant number, since it is smaller than the sum of its proper divisors (602644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521612 is a wasteful number, since it uses less digits than its factorization.

521612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457 (or 1455 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 521612 is about 722.2271110946. The cubic root of 521612 is about 80.4975244535.

Adding to 521612 its reverse (216125), we get a palindrome (737737).

The spelling of 521612 in words is "five hundred twenty-one thousand, six hundred twelve".