290661 has 8 divisors (see below), whose sum is σ = 442944. Its totient is φ = 166080.

The previous prime is 290659. The next prime is 290663. The reversal of 290661 is 166092.

It is an interprime number because it is at equal distance from previous prime (290659) and next prime (290663).

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

It is not a de Polignac number, because 290661 - 2¹ = 290659 is a prime.

It is a Curzon number.

290661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290663) 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 7 ways as a sum of consecutive naturals, for example, 6900 + ... + 6941.

It is an arithmetic number, because the mean of its divisors is an integer number (55368).

2²⁹⁰⁶⁶¹ is an apocalyptic number.

290661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

290661 is a deficient number, since it is larger than the sum of its proper divisors (152283).

290661 is a wasteful number, since it uses less digits than its factorization.

290661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13851.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 290661 is about 539.1298544878. The cubic root of 290661 is about 66.2413113086.

The spelling of 290661 in words is "two hundred ninety thousand, six hundred sixty-one".