181982071 has 4 divisors (see below), whose sum is σ = 183071952. Its totient is φ = 180892192.

The previous prime is 181982051. The next prime is 181982081. The reversal of 181982071 is 170289181.

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 181982071 - 2¹⁵ = 181949303 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 181982071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181982011) 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 3 ways as a sum of consecutive naturals, for example, 544690 + ... + 545023.

It is an arithmetic number, because the mean of its divisors is an integer number (45767988).

Almost surely, 2^181982071 is an apocalyptic number.

181982071 is a deficient number, since it is larger than the sum of its proper divisors (1089881).

181982071 is a wasteful number, since it uses less digits than its factorization.

181982071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089880.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 181982071 is about 13490.0730539164. The cubic root of 181982071 is about 566.6865013050.

The spelling of 181982071 in words is "one hundred eighty-one million, nine hundred eighty-two thousand, seventy-one".