198997137 has 12 divisors (see below), whose sum is σ = 295209460. Its totient is φ = 129079008.

The previous prime is 198997079. The next prime is 198997151. The reversal of 198997137 is 731799891.

It can be written as a sum of positive squares in 2 ways, for example, as 71216721 + 127780416 = 8439^2 + 11304^2 .

It is not a de Polignac number, because 198997137 - 2⁷ = 198997009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198997177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 298462 + ... + 299127.

Almost surely, 2^198997137 is an apocalyptic number.

It is an amenable number.

198997137 is a deficient number, since it is larger than the sum of its proper divisors (96212323).

198997137 is a wasteful number, since it uses less digits than its factorization.

198997137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597632 (or 597629 counting only the distinct ones).

The product of its digits is 857304, while the sum is 54.

The square root of 198997137 is about 14106.6345029564. The cubic root of 198997137 is about 583.8244462398.

The spelling of 198997137 in words is "one hundred ninety-eight million, nine hundred ninety-seven thousand, one hundred thirty-seven".