290261 has 4 divisors (see below), whose sum is σ = 300300. Its totient is φ = 280224.

The previous prime is 290249. The next prime is 290317. The reversal of 290261 is 162092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244036 + 46225 = 494^2 + 215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-290261 is a prime.

It is a Duffinian number.

290261 is a modest number, since divided by 261 gives 29 as remainder.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290201) 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, 4976 + ... + 5033.

It is an arithmetic number, because the mean of its divisors is an integer number (75075).

2²⁹⁰²⁶¹ is an apocalyptic number.

It is an amenable number.

290261 is a deficient number, since it is larger than the sum of its proper divisors (10039).

290261 is a wasteful number, since it uses less digits than its factorization.

290261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10038.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 290261 is about 538.7587586295. The cubic root of 290261 is about 66.2109108439.

The spelling of 290261 in words is "two hundred ninety thousand, two hundred sixty-one".