697445909 has 2 divisors, whose sum is σ = 697445910. Its totient is φ = 697445908.

The previous prime is 697445899. The next prime is 697445963. The reversal of 697445909 is 909544796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645922225 + 51523684 = 25415^2 + 7178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697445909 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 (697445209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348722954 + 348722955.

It is an arithmetic number, because the mean of its divisors is an integer number (348722955).

Almost surely, 2^697445909 is an apocalyptic number.

It is an amenable number.

697445909 is a deficient number, since it is larger than the sum of its proper divisors (1).

697445909 is an equidigital number, since it uses as much as digits as its factorization.

697445909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 697445909 is about 26409.2012185147. The cubic root of 697445909 is about 886.8227867977.

The spelling of 697445909 in words is "six hundred ninety-seven million, four hundred forty-five thousand, nine hundred nine".