33138951 has 4 divisors (see below), whose sum is σ = 44185272. Its totient is φ = 22092632.

The previous prime is 33138949. The next prime is 33138961. The reversal of 33138951 is 15983133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15983133 = 3 ⋅5327711.

It is a cyclic number.

It is not a de Polignac number, because 33138951 - 2¹ = 33138949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33138961) 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, 5523156 + ... + 5523161.

It is an arithmetic number, because the mean of its divisors is an integer number (11046318).

Almost surely, 2^33138951 is an apocalyptic number.

33138951 is a deficient number, since it is larger than the sum of its proper divisors (11046321).

33138951 is a wasteful number, since it uses less digits than its factorization.

33138951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11046320.

The product of its digits is 9720, while the sum is 33.

The square root of 33138951 is about 5756.6440744587. The cubic root of 33138951 is about 321.2029946315.

The spelling of 33138951 in words is "thirty-three million, one hundred thirty-eight thousand, nine hundred fifty-one".