693640361 has 2 divisors, whose sum is σ = 693640362. Its totient is φ = 693640360.

The previous prime is 693640319. The next prime is 693640397. The reversal of 693640361 is 163046396.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501984025 + 191656336 = 22405^2 + 13844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-693640361 is a prime.

It is a super-2 number, since 2×693640361² = 962273900816420642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (693640061) 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 as a sum of consecutive naturals, namely, 346820180 + 346820181.

It is an arithmetic number, because the mean of its divisors is an integer number (346820181).

Almost surely, 2^693640361 is an apocalyptic number.

It is an amenable number.

693640361 is a deficient number, since it is larger than the sum of its proper divisors (1).

693640361 is an equidigital number, since it uses as much as digits as its factorization.

693640361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 693640361 is about 26337.0530052244. The cubic root of 693640361 is about 885.2068891863.

The spelling of 693640361 in words is "six hundred ninety-three million, six hundred forty thousand, three hundred sixty-one".