691312 has 10 divisors (see below), whose sum is σ = 1339448. Its totient is φ = 345648.

The previous prime is 691309. The next prime is 691333. The reversal of 691312 is 213196.

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, 21588 + ... + 21619.

2⁶⁹¹³¹² is an apocalyptic number.

It is an amenable number.

691312 is a deficient number, since it is larger than the sum of its proper divisors (648136).

691312 is a wasteful number, since it uses less digits than its factorization.

691312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43215 (or 43209 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 691312 is about 831.4517424361. The cubic root of 691312 is about 88.4215313058.

The spelling of 691312 in words is "six hundred ninety-one thousand, three hundred twelve".