1689620197 has 2 divisors, whose sum is σ = 1689620198. Its totient is φ = 1689620196.

The previous prime is 1689620173. The next prime is 1689620221. The reversal of 1689620197 is 7910269861.

It is a balanced prime because it is at equal distance from previous prime (1689620173) and next prime (1689620221).

It can be written as a sum of positive squares in only one way, i.e., 1288379236 + 401240961 = 35894^2 + 20031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689620197 - 2¹⁹ = 1689095909 is a prime.

It is a super-2 number, since 2×1689620197² = 5709632820220637618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1689620197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689620117) 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, 844810098 + 844810099.

It is an arithmetic number, because the mean of its divisors is an integer number (844810099).

Almost surely, 2^1689620197 is an apocalyptic number.

It is an amenable number.

1689620197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689620197 is an equidigital number, since it uses as much as digits as its factorization.

1689620197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1689620197 is about 41104.9899282313. The cubic root of 1689620197 is about 1191.0491881468.

The spelling of 1689620197 in words is "one billion, six hundred eighty-nine million, six hundred twenty thousand, one hundred ninety-seven".