291229 has 4 divisors (see below), whose sum is σ = 293020. Its totient is φ = 289440.

The previous prime is 291217. The next prime is 291253. The reversal of 291229 is 922192.

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

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 152100 = 373^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 291229 - 2⁷ = 291101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291209) 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, 624 + ... + 985.

It is an arithmetic number, because the mean of its divisors is an integer number (73255).

2²⁹¹²²⁹ is an apocalyptic number.

It is an amenable number.

291229 is a deficient number, since it is larger than the sum of its proper divisors (1791).

291229 is a wasteful number, since it uses less digits than its factorization.

291229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790.

The product of its digits is 648, while the sum is 25.

The square root of 291229 is about 539.6563721481. The cubic root of 291229 is about 66.2844320837.

It can be divided in two parts, 2912 and 29, that multiplied together give a palindrome (84448).

The spelling of 291229 in words is "two hundred ninety-one thousand, two hundred twenty-nine".