691331112 has 224 divisors, whose sum is σ = 2172009600. Its totient is φ = 204913152.

The previous prime is 691331111. The next prime is 691331119. The reversal of 691331112 is 211133196.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is not an unprimeable number, because it can be changed into a prime (691331111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1883553 + ... + 1883919.

Almost surely, 2^691331112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691331112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086004800).

691331112 is an abundant number, since it is smaller than the sum of its proper divisors (1480678488).

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

691331112 is a wasteful number, since it uses less digits than its factorization.

691331112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 408 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 691331112 is about 26293.1761489555. The cubic root of 691331112 is about 884.2234613172.

It can be divided in two parts, 6913 and 31112, that added together give a square (38025 = 195²).

The spelling of 691331112 in words is "six hundred ninety-one million, three hundred thirty-one thousand, one hundred twelve".