695969609 has 4 divisors (see below), whose sum is σ = 696035604. Its totient is φ = 695903616.

The previous prime is 695969597. The next prime is 695969611. The reversal of 695969609 is 906969596.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 145926400 + 550043209 = 12080^2 + 23453^2 .

It is a cyclic number.

It is not a de Polignac number, because 695969609 - 2⁸ = 695969353 is a prime.

It is a super-2 number, since 2×695969609² = 968747393303225762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (695969699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13232 + ... + 39585.

It is an arithmetic number, because the mean of its divisors is an integer number (174008901).

Almost surely, 2^695969609 is an apocalyptic number.

It is an amenable number.

695969609 is a deficient number, since it is larger than the sum of its proper divisors (65995).

695969609 is a wasteful number, since it uses less digits than its factorization.

695969609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65994.

The product of its (nonzero) digits is 7085880, while the sum is 59.

The square root of 695969609 is about 26381.2359263170. The cubic root of 695969609 is about 886.1966253034.

The spelling of 695969609 in words is "six hundred ninety-five million, nine hundred sixty-nine thousand, six hundred nine".