33181172649 has 9 divisors (see below), whose sum is σ = 47929149853. Its totient is φ = 22120417452.

The previous prime is 33181172593. The next prime is 33181172669. The reversal of 33181172649 is 94627118133.

The square root of 33181172649 is 182157.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 33181172649 - 2²¹ = 33179075497 is a prime.

It is a super-2 number, since 2×33181172649² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (33181172669) 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 8 ways as a sum of consecutive naturals, for example, 516112 + ... + 576830.

Almost surely, 2^33181172649 is an apocalyptic number.

33181172649 is the 182157-th square number.

33181172649 is the 91079-th centered octagonal number.

It is an amenable number.

33181172649 is a deficient number, since it is larger than the sum of its proper divisors (14747977204).

33181172649 is an frugal number, since it uses more digits than its factorization.

33181172649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121444 (or 60722 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 33181172649 in words is "thirty-three billion, one hundred eighty-one million, one hundred seventy-two thousand, six hundred forty-nine".