181112117621287 has 4 divisors (see below), whose sum is σ = 181631063517400. Its totient is φ = 180593171725176.

The previous prime is 181112117621261. The next prime is 181112117621297. The reversal of 181112117621287 is 782126711211181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 181112117621287 - 2³⁵ = 181077757882919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181112117621287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181112117621297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259472947533 + ... + 259472948230.

It is an arithmetic number, because the mean of its divisors is an integer number (45407765879350).

Almost surely, 2^{181112117621287} is an apocalyptic number.

181112117621287 is a deficient number, since it is larger than the sum of its proper divisors (518945896113).

181112117621287 is an equidigital number, since it uses as much as digits as its factorization.

181112117621287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518945896112.

The product of its digits is 150528, while the sum is 49.

The spelling of 181112117621287 in words is "one hundred eighty-one trillion, one hundred twelve billion, one hundred seventeen million, six hundred twenty-one thousand, two hundred eighty-seven".