697985647 has 2 divisors, whose sum is σ = 697985648. Its totient is φ = 697985646.

The previous prime is 697985641. The next prime is 697985671. The reversal of 697985647 is 746589796.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697985647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697985641) 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, 348992823 + 348992824.

It is an arithmetic number, because the mean of its divisors is an integer number (348992824).

Almost surely, 2^697985647 is an apocalyptic number.

697985647 is a deficient number, since it is larger than the sum of its proper divisors (1).

697985647 is an equidigital number, since it uses as much as digits as its factorization.

697985647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 61.

The square root of 697985647 is about 26419.4179913184. The cubic root of 697985647 is about 887.0514920069.

The spelling of 697985647 in words is "six hundred ninety-seven million, nine hundred eighty-five thousand, six hundred forty-seven".