691000444 has 12 divisors (see below), whose sum is σ = 1210185144. Its totient is φ = 345233264.

The previous prime is 691000391. The next prime is 691000451. The reversal of 691000444 is 444000196.

It is a super-2 number, since 2×691000444² = 954963227216394272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60859 + ... + 71314.

It is an arithmetic number, because the mean of its divisors is an integer number (100848762).

Almost surely, 2^691000444 is an apocalyptic number.

It is an amenable number.

691000444 is a deficient number, since it is larger than the sum of its proper divisors (519184700).

691000444 is a wasteful number, since it uses less digits than its factorization.

691000444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133484 (or 133482 counting only the distinct ones).

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

The square root of 691000444 is about 26286.8873014665. The cubic root of 691000444 is about 884.0824622951.

The spelling of 691000444 in words is "six hundred ninety-one million, four hundred forty-four", and thus it is an aban number.