33010981 has 4 divisors (see below), whose sum is σ = 33043500. Its totient is φ = 32978464.

The previous prime is 33010969. The next prime is 33010987. The reversal of 33010981 is 18901033.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18901033 = 61 ⋅309853.

It can be written as a sum of positive squares in 2 ways, for example, as 23677956 + 9333025 = 4866^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 33010981 - 2⁵ = 33010949 is a prime.

It is a super-2 number, since 2×33010981² = 2179449733164722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33010987) 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, 14686 + ... + 16783.

It is an arithmetic number, because the mean of its divisors is an integer number (8260875).

Almost surely, 2^33010981 is an apocalyptic number.

It is an amenable number.

33010981 is a deficient number, since it is larger than the sum of its proper divisors (32519).

33010981 is a wasteful number, since it uses less digits than its factorization.

33010981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32518.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 33010981 is about 5745.5183404111. The cubic root of 33010981 is about 320.7890067657.

It can be divided in two parts, 330 and 10981, that added together give a palindrome (11311).

The spelling of 33010981 in words is "thirty-three million, ten thousand, nine hundred eighty-one".