181079021513 has 8 divisors (see below), whose sum is σ = 195191642688. Its totient is φ = 166992609744.

The previous prime is 181079021491. The next prime is 181079021531. The reversal of 181079021513 is 315120970181.

It is a happy number.

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 181079021513 - 2¹² = 181079017417 is a prime.

It is a super-2 number, since 2×181079021513² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181079021573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6537995 + ... + 6565632.

It is an arithmetic number, because the mean of its divisors is an integer number (24398955336).

Almost surely, 2^181079021513 is an apocalyptic number.

181079021513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

181079021513 is a deficient number, since it is larger than the sum of its proper divisors (14112621175).

181079021513 is a wasteful number, since it uses less digits than its factorization.

181079021513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13104703.

The product of its (nonzero) digits is 15120, while the sum is 38.

Adding to 181079021513 its reverse (315120970181), we get a palindrome (496199991694).

The spelling of 181079021513 in words is "one hundred eighty-one billion, seventy-nine million, twenty-one thousand, five hundred thirteen".