693505381 has 2 divisors, whose sum is σ = 693505382. Its totient is φ = 693505380.

The previous prime is 693505363. The next prime is 693505399. The reversal of 693505381 is 183505396.

It is a balanced prime because it is at equal distance from previous prime (693505363) and next prime (693505399).

It can be written as a sum of positive squares in only one way, i.e., 452200225 + 241305156 = 21265^2 + 15534^2 .

It is a cyclic number.

It is not a de Polignac number, because 693505381 - 2⁵ = 693505349 is a prime.

It is a super-2 number, since 2×693505381² = 961899426951910322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (693505321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346752690 + 346752691.

It is an arithmetic number, because the mean of its divisors is an integer number (346752691).

Almost surely, 2^693505381 is an apocalyptic number.

It is an amenable number.

693505381 is a deficient number, since it is larger than the sum of its proper divisors (1).

693505381 is an equidigital number, since it uses as much as digits as its factorization.

693505381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 693505381 is about 26334.4903311228. The cubic root of 693505381 is about 885.1494660682.

The spelling of 693505381 in words is "six hundred ninety-three million, five hundred five thousand, three hundred eighty-one".