694883958409 has 3 divisors (see below), whose sum is σ = 694884792007. Its totient is φ = 694883124812.

The previous prime is 694883958401. The next prime is 694883958413. The reversal of 694883958409 is 904859388496.

The square root of 694883958409 is 833597.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 281913212025 + 412970746384 = 530955^2 + 642628^2 .

It is not a de Polignac number, because 694883958409 - 2³ = 694883958401 is a prime.

It is a super-2 number, since 2×694883958409² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (694883958401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 416799 + ... + 1250395.

Almost surely, 2^694883958409 is an apocalyptic number.

694883958409 is the 833597-th square number.

694883958409 is the 416799-th centered octagonal number.

It is an amenable number.

694883958409 is a deficient number, since it is larger than the sum of its proper divisors (833598).

694883958409 is an frugal number, since it uses more digits than its factorization.

694883958409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667194 (or 833597 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 73.

The spelling of 694883958409 in words is "six hundred ninety-four billion, eight hundred eighty-three million, nine hundred fifty-eight thousand, four hundred nine".