691216395 has 16 divisors (see below), whose sum is σ = 1106453760. Its totient is φ = 368479584.

The previous prime is 691216387. The next prime is 691216399. The reversal of 691216395 is 593612196.

It is not a de Polignac number, because 691216395 - 2³ = 691216387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691216399) 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 15 ways as a sum of consecutive naturals, for example, 27666 + ... + 46344.

It is an arithmetic number, because the mean of its divisors is an integer number (69153360).

Almost surely, 2^691216395 is an apocalyptic number.

691216395 is a deficient number, since it is larger than the sum of its proper divisors (415237365).

691216395 is a wasteful number, since it uses less digits than its factorization.

691216395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21154.

The product of its digits is 87480, while the sum is 42.

The square root of 691216395 is about 26290.9945608758. The cubic root of 691216395 is about 884.1745503240.

The spelling of 691216395 in words is "six hundred ninety-one million, two hundred sixteen thousand, three hundred ninety-five".