691444 has 12 divisors (see below), whose sum is σ = 1303204. Its totient is φ = 319104.

The previous prime is 691433. The next prime is 691451. The reversal of 691444 is 444196.

691444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 35344 + 656100 = 188^2 + 810^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6597 + ... + 6700.

2⁶⁹¹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

691444 is a deficient number, since it is larger than the sum of its proper divisors (611760).

691444 is a wasteful number, since it uses less digits than its factorization.

691444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13314 (or 13312 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 691444 is about 831.5311178783. The cubic root of 691444 is about 88.4271587212.

The spelling of 691444 in words is "six hundred ninety-one thousand, four hundred forty-four".