691000693 has 2 divisors, whose sum is σ = 691000694. Its totient is φ = 691000692.

The previous prime is 691000643. The next prime is 691000727. The reversal of 691000693 is 396000196.

It is an a-pointer prime, because the next prime (691000727) can be obtained adding 691000693 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 627352209 + 63648484 = 25047^2 + 7978^2 .

It is a cyclic number.

It is not a de Polignac number, because 691000693 - 2²⁵ = 657446261 is a prime.

691000693 is a modest number, since divided by 693 gives 691 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691000643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345500346 + 345500347.

It is an arithmetic number, because the mean of its divisors is an integer number (345500347).

Almost surely, 2^691000693 is an apocalyptic number.

It is an amenable number.

691000693 is a deficient number, since it is larger than the sum of its proper divisors (1).

691000693 is an equidigital number, since it uses as much as digits as its factorization.

691000693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 691000693 is about 26286.8920376677. The cubic root of 691000693 is about 884.0825684872.

The spelling of 691000693 in words is "six hundred ninety-one million, six hundred ninety-three", and thus it is an aban number.