18199705231 has 8 divisors (see below), whose sum is σ = 18435078144. Its totient is φ = 17964715800.

The previous prime is 18199705217. The next prime is 18199705253. The reversal of 18199705231 is 13250799181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18199705231 - 2¹³ = 18199697039 is a prime.

It is a super-2 number, since 2×18199705231² (a number of 21 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 (18199705031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280 + ... + 190786.

It is an arithmetic number, because the mean of its divisors is an integer number (2304384768).

Almost surely, 2^18199705231 is an apocalyptic number.

18199705231 is a deficient number, since it is larger than the sum of its proper divisors (235372913).

18199705231 is a wasteful number, since it uses less digits than its factorization.

18199705231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191741.

The product of its (nonzero) digits is 136080, while the sum is 46.

It can be divided in two parts, 1819970 and 5231, that added together give a square (1825201 = 1351²).

The spelling of 18199705231 in words is "eighteen billion, one hundred ninety-nine million, seven hundred five thousand, two hundred thirty-one".