33131145 has 16 divisors (see below), whose sum is σ = 53307072. Its totient is φ = 17570880.

The previous prime is 33131107. The next prime is 33131149. The reversal of 33131145 is 54113133.

It is not a de Polignac number, because 33131145 - 2¹⁴ = 33114761 is a prime.

It is a super-2 number, since 2×33131145² = 2195345538022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33131149) 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, 3387 + ... + 8816.

It is an arithmetic number, because the mean of its divisors is an integer number (3331692).

Almost surely, 2^33131145 is an apocalyptic number.

It is an amenable number.

33131145 is a deficient number, since it is larger than the sum of its proper divisors (20175927).

33131145 is a wasteful number, since it uses less digits than its factorization.

33131145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12392.

The product of its digits is 540, while the sum is 21.

The square root of 33131145 is about 5755.9660353411. The cubic root of 33131145 is about 321.1777724745.

Adding to 33131145 its reverse (54113133), we get a palindrome (87244278).

The spelling of 33131145 in words is "thirty-three million, one hundred thirty-one thousand, one hundred forty-five".