33373981 has 2 divisors, whose sum is σ = 33373982. Its totient is φ = 33373980.

The previous prime is 33373969. The next prime is 33373987. The reversal of 33373981 is 18937333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22752900 + 10621081 = 4770^2 + 3259^2 .

It is a cyclic number.

It is not a de Polignac number, because 33373981 - 2⁷ = 33373853 is a prime.

It is a super-2 number, since 2×33373981² = 2227645215576722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33373981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33373987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16686990 + 16686991.

It is an arithmetic number, because the mean of its divisors is an integer number (16686991).

Almost surely, 2^33373981 is an apocalyptic number.

It is an amenable number.

33373981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33373981 is an equidigital number, since it uses as much as digits as its factorization.

33373981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 33373981 is about 5777.0218105872. The cubic root of 33373981 is about 321.9605580330.

The spelling of 33373981 in words is "thirty-three million, three hundred seventy-three thousand, nine hundred eighty-one".