691216436 has 12 divisors (see below), whose sum is σ = 1209815040. Its totient is φ = 345555000.

The previous prime is 691216403. The next prime is 691216439. The reversal of 691216436 is 634612196.

It is a super-2 number, since 2×691216436² = 955560322793084192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 691216436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691216439) 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 3 ways as a sum of consecutive naturals, for example, 37325 + ... + 52683.

It is an arithmetic number, because the mean of its divisors is an integer number (100817920).

Almost surely, 2^691216436 is an apocalyptic number.

It is an amenable number.

691216436 is a deficient number, since it is larger than the sum of its proper divisors (518598604).

691216436 is a wasteful number, since it uses less digits than its factorization.

691216436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26614 (or 26612 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 691216436 is about 26290.9953406104. The cubic root of 691216436 is about 884.1745678058.

It can be divided in two parts, 69121 and 6436, that added together give a palindrome (75557).

The spelling of 691216436 in words is "six hundred ninety-one million, two hundred sixteen thousand, four hundred thirty-six".