290521 has 15 divisors (see below), whose sum is σ = 372533.
Its totient is φ = 226380.
The previous prime is 290509. The next prime is 290527. The reversal of 290521 is 125092.
The square root of 290521 is 539.
It is a perfect power (a square), and thus also a powerful number.
It is not a de Polignac number, because 290521 - 25 = 290489 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is not an unprimeable number, because it can be changed into a prime (290527) 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 14 ways as a sum of consecutive naturals, for example, 26406 + ... + 26416.
290521 is a Friedman number, since it can be written as (510+29)^2, using all its digits and the basic arithmetic operations.
2290521 is an apocalyptic number.
290521 is the 539-th square number.
290521 is the 270-th centered octagonal number.
It is an amenable number.
290521 is a deficient number, since it is larger than the sum of its proper divisors (82012).
290521 is an frugal number, since it uses more digits than its factorization.
290521 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 50 (or 18 counting only the distinct ones).
The product of its (nonzero) digits is 180, while the sum is 19.
The cubic root of 290521 is about 66.2306743204.
It can be divided in two parts, 2905 and 21, that added together give a triangular number (2926 = T76).
The spelling of 290521 in words is "two hundred ninety thousand, five hundred twenty-one".