181487013 has 4 divisors (see below), whose sum is σ = 241982688. Its totient is φ = 120991340.

The previous prime is 181487011. The next prime is 181487023. The reversal of 181487013 is 310784181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 181487013 - 2¹ = 181487011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181487011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30247833 + ... + 30247838.

It is an arithmetic number, because the mean of its divisors is an integer number (60495672).

Almost surely, 2^181487013 is an apocalyptic number.

It is an amenable number.

181487013 is a deficient number, since it is larger than the sum of its proper divisors (60495675).

181487013 is an equidigital number, since it uses as much as digits as its factorization.

181487013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60495674.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 181487013 is about 13471.7115839080. The cubic root of 181487013 is about 566.1721695678.

The spelling of 181487013 in words is "one hundred eighty-one million, four hundred eighty-seven thousand, thirteen".