181374987 has 16 divisors (see below), whose sum is σ = 252760320. Its totient is φ = 115470432.

The previous prime is 181374959. The next prime is 181375013. The reversal of 181374987 is 789473181.

It is a de Polignac number, because none of the positive numbers 2^k-181374987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181374917) 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 15 ways as a sum of consecutive naturals, for example, 49213 + ... + 52769.

It is an arithmetic number, because the mean of its divisors is an integer number (15797520).

Almost surely, 2^181374987 is an apocalyptic number.

181374987 is a deficient number, since it is larger than the sum of its proper divisors (71385333).

181374987 is a wasteful number, since it uses less digits than its factorization.

181374987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322.

The product of its digits is 338688, while the sum is 48.

The square root of 181374987 is about 13467.5531185141. The cubic root of 181374987 is about 566.0556524000.

The spelling of 181374987 in words is "one hundred eighty-one million, three hundred seventy-four thousand, nine hundred eighty-seven".