33989523749 has 4 divisors (see below), whose sum is σ = 34908159564. Its totient is φ = 33070887936.

The previous prime is 33989523739. The next prime is 33989523751. The reversal of 33989523749 is 94732598933.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31224657025 + 2764866724 = 176705^2 + 52582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33989523749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33989523691 and 33989523700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33989523709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459317852 + ... + 459317925.

It is an arithmetic number, because the mean of its divisors is an integer number (8727039891).

Almost surely, 2^33989523749 is an apocalyptic number.

It is an amenable number.

33989523749 is a deficient number, since it is larger than the sum of its proper divisors (918635815).

33989523749 is an equidigital number, since it uses as much as digits as its factorization.

33989523749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918635814.

The product of its digits is 44089920, while the sum is 62.

The spelling of 33989523749 in words is "thirty-three billion, nine hundred eighty-nine million, five hundred twenty-three thousand, seven hundred forty-nine".