181920713 has 8 divisors (see below), whose sum is σ = 196280448. Its totient is φ = 167613264.

The previous prime is 181920701. The next prime is 181920779. The reversal of 181920713 is 317029181.

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

It is not a de Polignac number, because 181920713 - 2¹⁴ = 181904329 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 181920713.

It is not an unprimeable number, because it can be changed into a prime (181920113) 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, 5681 + ... + 19902.

It is an arithmetic number, because the mean of its divisors is an integer number (24535056).

Almost surely, 2^181920713 is an apocalyptic number.

181920713 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

181920713 is a deficient number, since it is larger than the sum of its proper divisors (14359735).

181920713 is a wasteful number, since it uses less digits than its factorization.

181920713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26143.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 181920713 is about 13487.7986713919. The cubic root of 181920713 is about 566.6228051787.

Adding to 181920713 its reverse (317029181), we get a palindrome (498949894).

The spelling of 181920713 in words is "one hundred eighty-one million, nine hundred twenty thousand, seven hundred thirteen".