33138251 has 4 divisors (see below), whose sum is σ = 33908952. Its totient is φ = 32367552.

The previous prime is 33138241. The next prime is 33138257. The reversal of 33138251 is 15283133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15283133 = 53 ⋅288361.

It is a cyclic number.

It is not a de Polignac number, because 33138251 - 2⁶ = 33138187 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 33138251.

It is not an unprimeable number, because it can be changed into a prime (33138257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385286 + ... + 385371.

It is an arithmetic number, because the mean of its divisors is an integer number (8477238).

Almost surely, 2^33138251 is an apocalyptic number.

33138251 is a deficient number, since it is larger than the sum of its proper divisors (770701).

33138251 is an equidigital number, since it uses as much as digits as its factorization.

33138251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770700.

The product of its digits is 2160, while the sum is 26.

The square root of 33138251 is about 5756.5832748254. The cubic root of 33138251 is about 321.2007330061.

The spelling of 33138251 in words is "thirty-three million, one hundred thirty-eight thousand, two hundred fifty-one".