33981971 has 4 divisors (see below), whose sum is σ = 35459472. Its totient is φ = 32504472.

The previous prime is 33981953. The next prime is 33981973. The reversal of 33981971 is 17918933.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33981971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33981973) 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, 738716 + ... + 738761.

It is an arithmetic number, because the mean of its divisors is an integer number (8864868).

Almost surely, 2^33981971 is an apocalyptic number.

33981971 is a deficient number, since it is larger than the sum of its proper divisors (1477501).

33981971 is a wasteful number, since it uses less digits than its factorization.

33981971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477500.

The product of its digits is 40824, while the sum is 41.

The square root of 33981971 is about 5829.4057158513. The cubic root of 33981971 is about 323.9039082768.

The spelling of 33981971 in words is "thirty-three million, nine hundred eighty-one thousand, nine hundred seventy-one".