693660397 has 2 divisors, whose sum is σ = 693660398. Its totient is φ = 693660396.

The previous prime is 693660389. The next prime is 693660421. The reversal of 693660397 is 793066396.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 468029956 + 225630441 = 21634^2 + 15021^2 .

It is a cyclic number.

It is not a de Polignac number, because 693660397 - 2³ = 693660389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 693660397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (693660307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346830198 + 346830199.

It is an arithmetic number, because the mean of its divisors is an integer number (346830199).

Almost surely, 2^693660397 is an apocalyptic number.

It is an amenable number.

693660397 is a deficient number, since it is larger than the sum of its proper divisors (1).

693660397 is an equidigital number, since it uses as much as digits as its factorization.

693660397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 49.

The square root of 693660397 is about 26337.4333791279. The cubic root of 693660397 is about 885.2154122555.

The spelling of 693660397 in words is "six hundred ninety-three million, six hundred sixty thousand, three hundred ninety-seven".