133181849 has 16 divisors (see below), whose sum is σ = 143621760. Its totient is φ = 123120000.

The previous prime is 133181843. The next prime is 133181861. The reversal of 133181849 is 948181331.

It is not a de Polignac number, because 133181849 - 2⁸ = 133181593 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (133181843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174629 + ... + 175389.

It is an arithmetic number, because the mean of its divisors is an integer number (8976360).

Almost surely, 2^133181849 is an apocalyptic number.

133181849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

133181849 is a deficient number, since it is larger than the sum of its proper divisors (10439911).

133181849 is a wasteful number, since it uses less digits than its factorization.

133181849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992.

The product of its digits is 20736, while the sum is 38.

The square root of 133181849 is about 11540.4440555812. Note that the first 3 decimals coincide. The cubic root of 133181849 is about 510.6794084899.

The spelling of 133181849 in words is "one hundred thirty-three million, one hundred eighty-one thousand, eight hundred forty-nine".