691853136 has 40 divisors (see below), whose sum is σ = 1924772640. Its totient is φ = 212877696.

The previous prime is 691853117. The next prime is 691853143. The reversal of 691853136 is 631358196.

It is a happy number.

691853136 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.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553746 + ... + 554993.

It is an arithmetic number, because the mean of its divisors is an integer number (48119316).

Almost surely, 2^691853136 is an apocalyptic number.

It is an amenable number.

691853136 is an abundant number, since it is smaller than the sum of its proper divisors (1232919504).

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

691853136 is a wasteful number, since it uses less digits than its factorization.

691853136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108763 (or 1108757 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 691853136 is about 26303.1012620185. The cubic root of 691853136 is about 884.4459643155.

The spelling of 691853136 in words is "six hundred ninety-one million, eight hundred fifty-three thousand, one hundred thirty-six".