291266 has 4 divisors (see below), whose sum is σ = 436902. Its totient is φ = 145632.

The previous prime is 291257. The next prime is 291271. The reversal of 291266 is 662192.

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

It can be written as a sum of positive squares in only one way, i.e., 286225 + 5041 = 535^2 + 71^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72815 + ... + 72818.

2²⁹¹²⁶⁶ is an apocalyptic number.

291266 is a deficient number, since it is larger than the sum of its proper divisors (145636).

291266 is a wasteful number, since it uses less digits than its factorization.

291266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145635.

The product of its digits is 1296, while the sum is 26.

The square root of 291266 is about 539.6906521332. The cubic root of 291266 is about 66.2872390617.

The spelling of 291266 in words is "two hundred ninety-one thousand, two hundred sixty-six".