697820807 has 2 divisors, whose sum is σ = 697820808. Its totient is φ = 697820806.

The previous prime is 697820801. The next prime is 697820831. The reversal of 697820807 is 708028796.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 697820807 - 2²⁶ = 630711943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697820801) 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, 348910403 + 348910404.

It is an arithmetic number, because the mean of its divisors is an integer number (348910404).

Almost surely, 2^697820807 is an apocalyptic number.

697820807 is a deficient number, since it is larger than the sum of its proper divisors (1).

697820807 is an equidigital number, since it uses as much as digits as its factorization.

697820807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 697820807 is about 26416.2981320245. The cubic root of 697820807 is about 886.9816562441.

The spelling of 697820807 in words is "six hundred ninety-seven million, eight hundred twenty thousand, eight hundred seven".