691598442 has 32 divisors (see below), whose sum is σ = 1459929600. Its totient is φ = 217809648.

The previous prime is 691598429. The next prime is 691598443. The reversal of 691598442 is 244895196.

691598442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 691598391 and 691598400.

It is not an unprimeable number, because it can be changed into a prime (691598443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35203 + ... + 51209.

It is an arithmetic number, because the mean of its divisors is an integer number (45622800).

Almost surely, 2^691598442 is an apocalyptic number.

691598442 is an abundant number, since it is smaller than the sum of its proper divisors (768331158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691598442 is a wasteful number, since it uses less digits than its factorization.

691598442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16410.

The product of its digits is 622080, while the sum is 48.

The square root of 691598442 is about 26298.2592960066. The cubic root of 691598442 is about 884.3374197335.

The spelling of 691598442 in words is "six hundred ninety-one million, five hundred ninety-eight thousand, four hundred forty-two".