691266 has 8 divisors (see below), whose sum is σ = 1382544. Its totient is φ = 230420.

The previous prime is 691241. The next prime is 691267. The reversal of 691266 is 662196.

It is a sphenic number, since it is the product of 3 distinct primes.

691266 is an admirable number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691266.

It is not an unprimeable number, because it can be changed into a prime (691267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57600 + ... + 57611.

It is an arithmetic number, because the mean of its divisors is an integer number (172818).

2⁶⁹¹²⁶⁶ is an apocalyptic number.

691266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691266 is a wasteful number, since it uses less digits than its factorization.

691266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115216.

The product of its digits is 3888, while the sum is 30.

The square root of 691266 is about 831.4240795166. The cubic root of 691266 is about 88.4195700685.

Subtracting from 691266 its product of digits (3888), we obtain a triangular number (687378 = T₁₁₇₂).

The spelling of 691266 in words is "six hundred ninety-one thousand, two hundred sixty-six".