691452523 has 2 divisors, whose sum is σ = 691452524. Its totient is φ = 691452522.

The previous prime is 691452491. The next prime is 691452571. The reversal of 691452523 is 325254196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691452523 - 2⁵ = 691452491 is a prime.

It is not a weakly prime, because it can be changed into another prime (691452583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345726261 + 345726262.

It is an arithmetic number, because the mean of its divisors is an integer number (345726262).

Almost surely, 2^691452523 is an apocalyptic number.

691452523 is a deficient number, since it is larger than the sum of its proper divisors (1).

691452523 is an equidigital number, since it uses as much as digits as its factorization.

691452523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 691452523 is about 26295.4848405577. The cubic root of 691452523 is about 884.2752204858.

The spelling of 691452523 in words is "six hundred ninety-one million, four hundred fifty-two thousand, five hundred twenty-three".