697720189 has 2 divisors, whose sum is σ = 697720190. Its totient is φ = 697720188.

The previous prime is 697720183. The next prime is 697720201. The reversal of 697720189 is 981027796.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494172900 + 203547289 = 22230^2 + 14267^2 .

It is a cyclic number.

It is not a de Polignac number, because 697720189 - 2¹¹ = 697718141 is a prime.

It is a super-3 number, since 3×697720189³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697720183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348860094 + 348860095.

It is an arithmetic number, because the mean of its divisors is an integer number (348860095).

Almost surely, 2^697720189 is an apocalyptic number.

It is an amenable number.

697720189 is a deficient number, since it is larger than the sum of its proper divisors (1).

697720189 is an equidigital number, since it uses as much as digits as its factorization.

697720189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 697720189 is about 26414.3935951594. The cubic root of 697720189 is about 886.9390232314.

The spelling of 697720189 in words is "six hundred ninety-seven million, seven hundred twenty thousand, one hundred eighty-nine".