198126631 has 2 divisors, whose sum is σ = 198126632. Its totient is φ = 198126630.

The previous prime is 198126587. The next prime is 198126713. The reversal of 198126631 is 136621891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198126631 - 2⁷ = 198126503 is a prime.

It is a super-3 number, since 3×198126631³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198120631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99063315 + 99063316.

It is an arithmetic number, because the mean of its divisors is an integer number (99063316).

Almost surely, 2^198126631 is an apocalyptic number.

198126631 is a deficient number, since it is larger than the sum of its proper divisors (1).

198126631 is an equidigital number, since it uses as much as digits as its factorization.

198126631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 198126631 is about 14075.7461969162. The cubic root of 198126631 is about 582.9718953526.

The spelling of 198126631 in words is "one hundred ninety-eight million, one hundred twenty-six thousand, six hundred thirty-one".