198137 has 4 divisors (see below), whose sum is σ = 199056. Its totient is φ = 197220.

The previous prime is 198127. The next prime is 198139. The reversal of 198137 is 731891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 731891 = 41 ⋅17851.

It is a cyclic number.

It is not a de Polignac number, because 198137 - 2⁶ = 198073 is a prime.

It is a super-3 number, since 3×198137³ = 23335547986072059, which contains 333 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198137.

It is not an unprimeable number, because it can be changed into a prime (198139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62 + ... + 632.

It is an arithmetic number, because the mean of its divisors is an integer number (49764).

2¹⁹⁸¹³⁷ is an apocalyptic number.

It is an amenable number.

198137 is a deficient number, since it is larger than the sum of its proper divisors (919).

198137 is an equidigital number, since it uses as much as digits as its factorization.

198137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918.

The product of its digits is 1512, while the sum is 29.

The square root of 198137 is about 445.1258249080. The cubic root of 198137 is about 58.2982065162.

The spelling of 198137 in words is "one hundred ninety-eight thousand, one hundred thirty-seven".