197131138 has 12 divisors (see below), whose sum is σ = 300635010. Its totient is φ = 96946080.

The previous prime is 197131117. The next prime is 197131169. The reversal of 197131138 is 831131791.

It can be written as a sum of positive squares in 3 ways, for example, as 34492129 + 162639009 = 5873^2 + 12753^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5803 + ... + 20686.

Almost surely, 2^197131138 is an apocalyptic number.

197131138 is a deficient number, since it is larger than the sum of its proper divisors (103503872).

197131138 is an equidigital number, since it uses as much as digits as its factorization.

197131138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26613 (or 26552 counting only the distinct ones).

The product of its digits is 4536, while the sum is 34.

The square root of 197131138 is about 14040.3396682559. The cubic root of 197131138 is about 581.9938690836.

The spelling of 197131138 in words is "one hundred ninety-seven million, one hundred thirty-one thousand, one hundred thirty-eight".