291131 has 4 divisors (see below), whose sum is σ = 301200. Its totient is φ = 281064.

The previous prime is 291113. The next prime is 291143. The reversal of 291131 is 131192.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 291131 - 2¹⁰ = 290107 is a prime.

It is a super-2 number, since 2×291131² = 169514518322, which contains 22 as substring.

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 291131.

It is not an unprimeable number, because it can be changed into a prime (291101) 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, 4991 + ... + 5048.

It is an arithmetic number, because the mean of its divisors is an integer number (75300).

2²⁹¹¹³¹ is an apocalyptic number.

291131 is a deficient number, since it is larger than the sum of its proper divisors (10069).

291131 is a wasteful number, since it uses less digits than its factorization.

291131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068.

The product of its digits is 54, while the sum is 17.

The square root of 291131 is about 539.5655659880. The cubic root of 291131 is about 66.2769962364.

The spelling of 291131 in words is "two hundred ninety-one thousand, one hundred thirty-one".