197942072137 has 2 divisors, whose sum is σ = 197942072138. Its totient is φ = 197942072136.

The previous prime is 197942072099. The next prime is 197942072171. The reversal of 197942072137 is 731270249791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165776008336 + 32166063801 = 407156^2 + 179349^2 .

It is a cyclic number.

It is not a de Polignac number, because 197942072137 - 2¹⁵ = 197942039369 is a prime.

It is not a weakly prime, because it can be changed into another prime (197942072437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98971036068 + 98971036069.

It is an arithmetic number, because the mean of its divisors is an integer number (98971036069).

Almost surely, 2^197942072137 is an apocalyptic number.

It is an amenable number.

197942072137 is a deficient number, since it is larger than the sum of its proper divisors (1).

197942072137 is an equidigital number, since it uses as much as digits as its factorization.

197942072137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 52.

The spelling of 197942072137 in words is "one hundred ninety-seven billion, nine hundred forty-two million, seventy-two thousand, one hundred thirty-seven".