181301998 has 16 divisors (see below), whose sum is σ = 282847680. Its totient is φ = 87081696.

The previous prime is 181301993. The next prime is 181302001. The reversal of 181301998 is 899103181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 181301998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181301993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9661 + ... + 21352.

It is an arithmetic number, because the mean of its divisors is an integer number (17677980).

Almost surely, 2^181301998 is an apocalyptic number.

181301998 is a deficient number, since it is larger than the sum of its proper divisors (101545682).

181301998 is a wasteful number, since it uses less digits than its factorization.

181301998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31131.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 181301998 is about 13464.8430365898. The cubic root of 181301998 is about 565.9797114263.

The spelling of 181301998 in words is "one hundred eighty-one million, three hundred one thousand, nine hundred ninety-eight".