197913769 has 2 divisors, whose sum is σ = 197913770. Its totient is φ = 197913768.

The previous prime is 197913767. The next prime is 197913787. The reversal of 197913769 is 967319791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177555625 + 20358144 = 13325^2 + 4512^2 .

It is an emirp because it is prime and its reverse (967319791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197913769 - 2¹ = 197913767 is a prime.

It is a super-2 number, since 2×197913769² = 78339719919570722, which contains 22 as substring.

Together with 197913767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (197913761) 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, 98956884 + 98956885.

It is an arithmetic number, because the mean of its divisors is an integer number (98956885).

Almost surely, 2^197913769 is an apocalyptic number.

It is an amenable number.

197913769 is a deficient number, since it is larger than the sum of its proper divisors (1).

197913769 is an equidigital number, since it uses as much as digits as its factorization.

197913769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 642978, while the sum is 52.

The square root of 197913769 is about 14068.1828606256. The cubic root of 197913769 is about 582.7630440234.

The spelling of 197913769 in words is "one hundred ninety-seven million, nine hundred thirteen thousand, seven hundred sixty-nine".