290881 has 4 divisors (see below), whose sum is σ = 303552. Its totient is φ = 278212.

The previous prime is 290879. The next prime is 290897. The reversal of 290881 is 188092.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 290881 - 2¹ = 290879 is a prime.

It is a super-2 number, since 2×290881² = 169223512322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6301 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (75888).

2²⁹⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

290881 is a deficient number, since it is larger than the sum of its proper divisors (12671).

290881 is a wasteful number, since it uses less digits than its factorization.

290881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12670.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 290881 is about 539.3338483722. Note that the first 3 decimals coincide. The cubic root of 290881 is about 66.2580196771.

The spelling of 290881 in words is "two hundred ninety thousand, eight hundred eighty-one".