694534009 has 4 divisors (see below), whose sum is σ = 747959716. Its totient is φ = 641108304.

The previous prime is 694533991. The next prime is 694534069. The reversal of 694534009 is 900435496.

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

It can be written as a sum of positive squares in 2 ways, for example, as 203689984 + 490844025 = 14272^2 + 22155^2 .

It is a cyclic number.

It is not a de Polignac number, because 694534009 - 2⁷ = 694533881 is a prime.

It is a super-2 number, since 2×694534009² = 964754979315224162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (694534069) 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 in 3 ways as a sum of consecutive naturals, for example, 26712834 + ... + 26712859.

It is an arithmetic number, because the mean of its divisors is an integer number (186989929).

Almost surely, 2^694534009 is an apocalyptic number.

It is an amenable number.

694534009 is a deficient number, since it is larger than the sum of its proper divisors (53425707).

694534009 is a wasteful number, since it uses less digits than its factorization.

694534009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53425706.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 694534009 is about 26354.0131479060. The cubic root of 694534009 is about 885.5868766326.

The spelling of 694534009 in words is "six hundred ninety-four million, five hundred thirty-four thousand, nine".