691216 has 10 divisors (see below), whose sum is σ = 1339262. Its totient is φ = 345600.

The previous prime is 691199. The next prime is 691231. The reversal of 691216 is 612196.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 57600 = 796^2 + 240^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21585 + ... + 21616.

2⁶⁹¹²¹⁶ is an apocalyptic number.

It is an amenable number.

691216 is a deficient number, since it is larger than the sum of its proper divisors (648046).

691216 is a wasteful number, since it uses less digits than its factorization.

691216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43209 (or 43203 counting only the distinct ones).

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

The square root of 691216 is about 831.3940100819. The cubic root of 691216 is about 88.4174381902.

It can be divided in two parts, 6912 and 16, that multiplied together give a cube (110592 = 48³).

The spelling of 691216 in words is "six hundred ninety-one thousand, two hundred sixteen".