693881381 has 2 divisors, whose sum is σ = 693881382. Its totient is φ = 693881380.

The previous prime is 693881371. The next prime is 693881389. The reversal of 693881381 is 183188396.

It is a happy number.

693881381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566868481 + 127012900 = 23809^2 + 11270^2 .

It is a cyclic number.

It is not a de Polignac number, because 693881381 - 2⁶ = 693881317 is a prime.

It is a super-2 number, since 2×693881381² = 962942741796934322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (693881389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346940690 + 346940691.

It is an arithmetic number, because the mean of its divisors is an integer number (346940691).

Almost surely, 2^693881381 is an apocalyptic number.

It is an amenable number.

693881381 is a deficient number, since it is larger than the sum of its proper divisors (1).

693881381 is an equidigital number, since it uses as much as digits as its factorization.

693881381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 693881381 is about 26341.6282905974. The cubic root of 693881381 is about 885.3094052594.

The spelling of 693881381 in words is "six hundred ninety-three million, eight hundred eighty-one thousand, three hundred eighty-one".