290981 has 8 divisors (see below), whose sum is σ = 305184. Its totient is φ = 277200.

The previous prime is 290971. The next prime is 290987. The reversal of 290981 is 189092.

290981 = 30² + 31² + ... + 96².

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

It is a cyclic number.

It is not a de Polignac number, because 290981 - 2¹⁰ = 289957 is a prime.

It is a super-2 number, since 2×290981² = 169339884722, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 290981.

It is not an unprimeable number, because it can be changed into a prime (290987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2831 + ... + 2931.

It is an arithmetic number, because the mean of its divisors is an integer number (38148).

2²⁹⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

290981 is a deficient number, since it is larger than the sum of its proper divisors (14203).

290981 is a wasteful number, since it uses less digits than its factorization.

290981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 290981 is about 539.4265473630. The cubic root of 290981 is about 66.2656116051.

The spelling of 290981 in words is "two hundred ninety thousand, nine hundred eighty-one".