33313381 has 6 divisors (see below), whose sum is σ = 33905382. Its totient is φ = 32722920.

The previous prime is 33313367. The next prime is 33313409. The reversal of 33313381 is 18331333.

It can be written as a sum of positive squares in only one way, i.e., 19660356 + 13653025 = 4434^2 + 3695^2 .

It is not a de Polignac number, because 33313381 - 2⁵ = 33313349 is a prime.

It is a super-2 number, since 2×33313381² = 2219562707302322, 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 (33313351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44710 + ... + 45448.

It is an arithmetic number, because the mean of its divisors is an integer number (5650897).

Almost surely, 2^33313381 is an apocalyptic number.

It is an amenable number.

33313381 is a deficient number, since it is larger than the sum of its proper divisors (592001).

33313381 is an frugal number, since it uses more digits than its factorization.

33313381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 800 counting only the distinct ones).

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

The square root of 33313381 is about 5771.7745104950. The cubic root of 33313381 is about 321.7655694989.

The spelling of 33313381 in words is "thirty-three million, three hundred thirteen thousand, three hundred eighty-one".