697909 has 2 divisors, whose sum is σ = 697910. Its totient is φ = 697908.

The previous prime is 697897. The next prime is 697913. The reversal of 697909 is 909796.

697909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555025 + 142884 = 745^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 697909 - 2⁵ = 697877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348954 + 348955.

It is an arithmetic number, because the mean of its divisors is an integer number (348955).

2⁶⁹⁷⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

697909 is a deficient number, since it is larger than the sum of its proper divisors (1).

697909 is an equidigital number, since it uses as much as digits as its factorization.

697909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 697909 is about 835.4094804346. The cubic root of 697909 is about 88.7019021270.

The spelling of 697909 in words is "six hundred ninety-seven thousand, nine hundred nine".