696431891 has 4 divisors (see below), whose sum is σ = 697088112. Its totient is φ = 695775672.

The previous prime is 696431887. The next prime is 696431893. The reversal of 696431891 is 198134696.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 696431891 - 2² = 696431887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (696431893) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 326516 + ... + 328641.

It is an arithmetic number, because the mean of its divisors is an integer number (174272028).

Almost surely, 2^696431891 is an apocalyptic number.

696431891 is a deficient number, since it is larger than the sum of its proper divisors (656221).

696431891 is a wasteful number, since it uses less digits than its factorization.

696431891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656220.

The product of its digits is 279936, while the sum is 47.

The square root of 696431891 is about 26389.9960401664. The cubic root of 696431891 is about 886.3927938675.

The spelling of 696431891 in words is "six hundred ninety-six million, four hundred thirty-one thousand, eight hundred ninety-one".