691145914 has 16 divisors (see below), whose sum is σ = 1101623976. Its totient is φ = 324083200.

The previous prime is 691145909. The next prime is 691145933. The reversal of 691145914 is 419541196.

It can be written as a sum of positive squares in 4 ways, for example, as 688170289 + 2975625 = 26233^2 + 1725^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26617 + ... + 45724.

Almost surely, 2^691145914 is an apocalyptic number.

691145914 is a deficient number, since it is larger than the sum of its proper divisors (410478062).

691145914 is a wasteful number, since it uses less digits than its factorization.

691145914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72641.

The product of its digits is 38880, while the sum is 40.

The square root of 691145914 is about 26289.6541247693. The cubic root of 691145914 is about 884.1444972055.

It can be divided in two parts, 6911 and 45914, that added together give a palindrome (52825).

The spelling of 691145914 in words is "six hundred ninety-one million, one hundred forty-five thousand, nine hundred fourteen".