33331381 has 4 divisors (see below), whose sum is σ = 33536032. Its totient is φ = 33126732.

The previous prime is 33331351. The next prime is 33331399. The reversal of 33331381 is 18313333.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18313333 = 809 ⋅22637.

It is a cyclic number.

It is not a de Polignac number, because 33331381 - 2¹³ = 33323189 is a prime.

It is a super-2 number, since 2×33331381² = 2221961918734322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33331351) 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, 102081 + ... + 102406.

It is an arithmetic number, because the mean of its divisors is an integer number (8384008).

Almost surely, 2^33331381 is an apocalyptic number.

It is an amenable number.

33331381 is a deficient number, since it is larger than the sum of its proper divisors (204651).

33331381 is a wasteful number, since it uses less digits than its factorization.

33331381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204650.

The product of its digits is 1944, while the sum is 25.

The square root of 33331381 is about 5773.3336123941. Note that the first 3 decimals coincide. The cubic root of 33331381 is about 321.8235115555.

The spelling of 33331381 in words is "thirty-three million, three hundred thirty-one thousand, three hundred eighty-one".