291251 has 4 divisors (see below), whose sum is σ = 306600. Its totient is φ = 275904.

The previous prime is 291217. The next prime is 291253. The reversal of 291251 is 152192.

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 291251 - 2¹⁴ = 274867 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 291251.

It is not an unprimeable number, because it can be changed into a prime (291253) 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, 7646 + ... + 7683.

It is an arithmetic number, because the mean of its divisors is an integer number (76650).

2²⁹¹²⁵¹ is an apocalyptic number.

291251 is a deficient number, since it is larger than the sum of its proper divisors (15349).

291251 is a wasteful number, since it uses less digits than its factorization.

291251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15348.

The product of its digits is 180, while the sum is 20.

The square root of 291251 is about 539.6767551044. The cubic root of 291251 is about 66.2861011263.

The spelling of 291251 in words is "two hundred ninety-one thousand, two hundred fifty-one".