197907709789 has 2 divisors, whose sum is σ = 197907709790. Its totient is φ = 197907709788.

The previous prime is 197907709763. The next prime is 197907709793. The reversal of 197907709789 is 987907709791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184478840100 + 13428869689 = 429510^2 + 115883^2 .

It is a cyclic number.

It is not a de Polignac number, because 197907709789 - 2¹⁵ = 197907677021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197907709729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98953854894 + 98953854895.

It is an arithmetic number, because the mean of its divisors is an integer number (98953854895).

Almost surely, 2^197907709789 is an apocalyptic number.

It is an amenable number.

197907709789 is a deficient number, since it is larger than the sum of its proper divisors (1).

197907709789 is an equidigital number, since it uses as much as digits as its factorization.

197907709789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126023688, while the sum is 73.

The spelling of 197907709789 in words is "one hundred ninety-seven billion, nine hundred seven million, seven hundred nine thousand, seven hundred eighty-nine".