691612 has 12 divisors (see below), whose sum is σ = 1238776. Its totient is φ = 337680.

The previous prime is 691591. The next prime is 691631. The reversal of 691612 is 216196.

691612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

691612 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1839 + ... + 2182.

2⁶⁹¹⁶¹² is an apocalyptic number.

It is an amenable number.

691612 is a deficient number, since it is larger than the sum of its proper divisors (547164).

691612 is a wasteful number, since it uses less digits than its factorization.

691612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068 (or 4066 counting only the distinct ones).

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

The square root of 691612 is about 831.6321302114. The cubic root of 691612 is about 88.4343198505.

It can be divided in two parts, 69 and 1612, that added together give a square (1681 = 41²).

The spelling of 691612 in words is "six hundred ninety-one thousand, six hundred twelve".