33073981 has 4 divisors (see below), whose sum is σ = 33191964. Its totient is φ = 32956000.

The previous prime is 33073973. The next prime is 33074029. The reversal of 33073981 is 18937033.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24900100 + 8173881 = 4990^2 + 2859^2 .

It is a cyclic number.

It is not a de Polignac number, because 33073981 - 2³ = 33073973 is a prime.

It is a super-2 number, since 2×33073981² = 2187776438376722, 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 (33071981) 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, 58570 + ... + 59131.

It is an arithmetic number, because the mean of its divisors is an integer number (8297991).

Almost surely, 2^33073981 is an apocalyptic number.

It is an amenable number.

33073981 is a deficient number, since it is larger than the sum of its proper divisors (117983).

33073981 is a wasteful number, since it uses less digits than its factorization.

33073981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117982.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 33073981 is about 5750.9982611717. The cubic root of 33073981 is about 320.9929476361.

The spelling of 33073981 in words is "thirty-three million, seventy-three thousand, nine hundred eighty-one".