693735989 has 2 divisors, whose sum is σ = 693735990. Its totient is φ = 693735988.

The previous prime is 693735967. The next prime is 693736019. The reversal of 693735989 is 989537396.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392713489 + 301022500 = 19817^2 + 17350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-693735989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (693735929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346867994 + 346867995.

It is an arithmetic number, because the mean of its divisors is an integer number (346867995).

Almost surely, 2^693735989 is an apocalyptic number.

It is an amenable number.

693735989 is a deficient number, since it is larger than the sum of its proper divisors (1).

693735989 is an equidigital number, since it uses as much as digits as its factorization.

693735989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 59.

The square root of 693735989 is about 26338.8684077354. The cubic root of 693735989 is about 885.2475666898.

The spelling of 693735989 in words is "six hundred ninety-three million, seven hundred thirty-five thousand, nine hundred eighty-nine".