198731231 has 4 divisors (see below), whose sum is σ = 199378872. Its totient is φ = 198083592.

The previous prime is 198731227. The next prime is 198731237. The reversal of 198731231 is 132137891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198731231 - 2² = 198731227 is a prime.

It is a super-2 number, since 2×198731231² = 78988204349550722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198731191 and 198731200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198731237) 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, 323360 + ... + 323973.

It is an arithmetic number, because the mean of its divisors is an integer number (49844718).

Almost surely, 2^198731231 is an apocalyptic number.

198731231 is a deficient number, since it is larger than the sum of its proper divisors (647641).

198731231 is an equidigital number, since it uses as much as digits as its factorization.

198731231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647640.

The product of its digits is 9072, while the sum is 35.

The square root of 198731231 is about 14097.2064963240. The cubic root of 198731231 is about 583.5642890277.

The spelling of 198731231 in words is "one hundred ninety-eight million, seven hundred thirty-one thousand, two hundred thirty-one".