291001 has 4 divisors (see below), whose sum is σ = 292132. Its totient is φ = 289872.

The previous prime is 290999. The next prime is 291007. The reversal of 291001 is 100192.

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 can be written as a sum of positive squares in 2 ways, for example, as 251001 + 40000 = 501^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 291001 - 2¹ = 290999 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 291001.

It is not an unprimeable number, because it can be changed into a prime (291007) 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, 31 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (73033).

2²⁹¹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

291001 is a deficient number, since it is larger than the sum of its proper divisors (1131).

291001 is an equidigital number, since it uses as much as digits as its factorization.

291001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 291001 is about 539.4450852496. The cubic root of 291001 is about 66.2671297820.

Adding to 291001 its reverse (100192), we get a palindrome (391193).

The spelling of 291001 in words is "two hundred ninety-one thousand, one".