695131609 has 2 divisors, whose sum is σ = 695131610. Its totient is φ = 695131608.

The previous prime is 695131607. The next prime is 695131667. The reversal of 695131609 is 906131596.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523128384 + 172003225 = 22872^2 + 13115^2 .

It is a cyclic number.

It is not a de Polignac number, because 695131609 - 2¹ = 695131607 is a prime.

Together with 695131607, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (695131603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347565804 + 347565805.

It is an arithmetic number, because the mean of its divisors is an integer number (347565805).

Almost surely, 2^695131609 is an apocalyptic number.

It is an amenable number.

695131609 is a deficient number, since it is larger than the sum of its proper divisors (1).

695131609 is an equidigital number, since it uses as much as digits as its factorization.

695131609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 695131609 is about 26365.3486417305. The cubic root of 695131609 is about 885.8407998843.

The spelling of 695131609 in words is "six hundred ninety-five million, one hundred thirty-one thousand, six hundred nine".