198631006631 has 4 divisors (see below), whose sum is σ = 198712515432. Its totient is φ = 198549497832.

The previous prime is 198631006597. The next prime is 198631006649. The reversal of 198631006631 is 136600136891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198631006631 is a prime.

It is a super-2 number, since 2×198631006631² (a number of 23 digits) 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 (198631606631) 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, 40750745 + ... + 40755618.

It is an arithmetic number, because the mean of its divisors is an integer number (49678128858).

Almost surely, 2^198631006631 is an apocalyptic number.

198631006631 is a deficient number, since it is larger than the sum of its proper divisors (81508801).

198631006631 is an equidigital number, since it uses as much as digits as its factorization.

198631006631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81508800.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 198631006631 in words is "one hundred ninety-eight billion, six hundred thirty-one million, six thousand, six hundred thirty-one".