691593029 has 2 divisors, whose sum is σ = 691593030. Its totient is φ = 691593028.

The previous prime is 691592999. The next prime is 691593041. The reversal of 691593029 is 920395196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690270529 + 1322500 = 26273^2 + 1150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691593029 is a prime.

It is a super-2 number, since 2×691593029² = 956601835522789682, 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 (691593079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345796514 + 345796515.

It is an arithmetic number, because the mean of its divisors is an integer number (345796515).

Almost surely, 2^691593029 is an apocalyptic number.

It is an amenable number.

691593029 is a deficient number, since it is larger than the sum of its proper divisors (1).

691593029 is an equidigital number, since it uses as much as digits as its factorization.

691593029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 691593029 is about 26298.1563802484. The cubic root of 691593029 is about 884.3351125513.

The spelling of 691593029 in words is "six hundred ninety-one million, five hundred ninety-three thousand, twenty-nine".