691984607 has 2 divisors, whose sum is σ = 691984608. Its totient is φ = 691984606.

The previous prime is 691984597. The next prime is 691984613. The reversal of 691984607 is 706489196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691984607 - 2⁶ = 691984543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691984687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345992303 + 345992304.

It is an arithmetic number, because the mean of its divisors is an integer number (345992304).

Almost surely, 2^691984607 is an apocalyptic number.

691984607 is a deficient number, since it is larger than the sum of its proper divisors (1).

691984607 is an equidigital number, since it uses as much as digits as its factorization.

691984607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 691984607 is about 26305.6002972751. The cubic root of 691984607 is about 884.5019837339.

The spelling of 691984607 in words is "six hundred ninety-one million, nine hundred eighty-four thousand, six hundred seven".