290891 has 4 divisors (see below), whose sum is σ = 291984. Its totient is φ = 289800.

The previous prime is 290879. The next prime is 290897. The reversal of 290891 is 198092.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 290891 - 2⁶ = 290827 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 290891.

It is not an unprimeable number, because it can be changed into a prime (290897) 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, 146 + ... + 776.

It is an arithmetic number, because the mean of its divisors is an integer number (72996).

2²⁹⁰⁸⁹¹ is an apocalyptic number.

290891 is a deficient number, since it is larger than the sum of its proper divisors (1093).

290891 is an equidigital number, since it uses as much as digits as its factorization.

290891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092.

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

The square root of 290891 is about 539.3431189883. The cubic root of 290891 is about 66.2587789482.

It can be divided in two parts, 2908 and 91, that multiplied together give a triangular number (264628 = T₇₂₇).

The spelling of 290891 in words is "two hundred ninety thousand, eight hundred ninety-one".