691247106 has 72 divisors (see below), whose sum is σ = 1717934400. Its totient is φ = 200346960.

The previous prime is 691247093. The next prime is 691247143. The reversal of 691247106 is 601742196.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 43195 + ... + 56993.

It is an arithmetic number, because the mean of its divisors is an integer number (23860200).

Almost surely, 2^691247106 is an apocalyptic number.

691247106 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 691247106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (858967200).

691247106 is an abundant number, since it is smaller than the sum of its proper divisors (1026687294).

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

691247106 is a wasteful number, since it uses less digits than its factorization.

691247106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13852 (or 13838 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 691247106 is about 26291.5786136930. The cubic root of 691247106 is about 884.1876448642.

The spelling of 691247106 in words is "six hundred ninety-one million, two hundred forty-seven thousand, one hundred six".