197128631 has 8 divisors (see below), whose sum is σ = 233058720. Its totient is φ = 163140768.

The previous prime is 197128627. The next prime is 197128663. The reversal of 197128631 is 136821791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 197128631 - 2² = 197128627 is a prime.

It is a super-2 number, since 2×197128631² = 77719394319868322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197128831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485336 + ... + 485741.

It is an arithmetic number, because the mean of its divisors is an integer number (29132340).

Almost surely, 2^197128631 is an apocalyptic number.

197128631 is a deficient number, since it is larger than the sum of its proper divisors (35930089).

197128631 is an equidigital number, since it uses as much as digits as its factorization.

197128631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971113.

The product of its digits is 18144, while the sum is 38.

The square root of 197128631 is about 14040.2503895052. The cubic root of 197128631 is about 581.9914019191.

The spelling of 197128631 in words is "one hundred ninety-seven million, one hundred twenty-eight thousand, six hundred thirty-one".