181431198 has 32 divisors (see below), whose sum is σ = 434196000. Its totient is φ = 55824768.

The previous prime is 181431197. The next prime is 181431203. The reversal of 181431198 is 891134181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181431193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128523 + ... + 129926.

It is an arithmetic number, because the mean of its divisors is an integer number (13568625).

Almost surely, 2^181431198 is an apocalyptic number.

181431198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

181431198 is an abundant number, since it is smaller than the sum of its proper divisors (252764802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181431198 is a wasteful number, since it uses less digits than its factorization.

181431198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258473 (or 258467 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 181431198 is about 13469.6398615553. The cubic root of 181431198 is about 566.1141229171.

It can be divided in two parts, 1814311 and 98, that added together give a square (1814409 = 1347²).

The spelling of 181431198 in words is "one hundred eighty-one million, four hundred thirty-one thousand, one hundred ninety-eight".