197780069 has 2 divisors, whose sum is σ = 197780070. Its totient is φ = 197780068.

The previous prime is 197780053. The next prime is 197780071. The reversal of 197780069 is 960087791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197767969 + 12100 = 14063^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 197780069 - 2⁴ = 197780053 is a prime.

It is a super-2 number, since 2×197780069² = 78233911387289522, which contains 22 as substring.

Together with 197780071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197780039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98890034 + 98890035.

It is an arithmetic number, because the mean of its divisors is an integer number (98890035).

Almost surely, 2^197780069 is an apocalyptic number.

It is an amenable number.

197780069 is a deficient number, since it is larger than the sum of its proper divisors (1).

197780069 is an equidigital number, since it uses as much as digits as its factorization.

197780069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 197780069 is about 14063.4302003459. The cubic root of 197780069 is about 582.6317865720.

The spelling of 197780069 in words is "one hundred ninety-seven million, seven hundred eighty thousand, sixty-nine".