181849745 has 32 divisors (see below), whose sum is σ = 273079296. Its totient is φ = 112939200.

The previous prime is 181849739. The next prime is 181849757. The reversal of 181849745 is 547948181.

It is not a de Polignac number, because 181849745 - 2¹⁰ = 181848721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181849745.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126722 + ... + 128148.

It is an arithmetic number, because the mean of its divisors is an integer number (8533728).

Almost surely, 2^181849745 is an apocalyptic number.

It is an amenable number.

181849745 is a deficient number, since it is larger than the sum of its proper divisors (91229551).

181849745 is a wasteful number, since it uses less digits than its factorization.

181849745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781.

The product of its digits is 322560, while the sum is 47.

The square root of 181849745 is about 13485.1675925811. The cubic root of 181849745 is about 566.5491149858.

The spelling of 181849745 in words is "one hundred eighty-one million, eight hundred forty-nine thousand, seven hundred forty-five".