33013531981 has 2 divisors, whose sum is σ = 33013531982. Its totient is φ = 33013531980.

The previous prime is 33013531963. The next prime is 33013532003. The reversal of 33013531981 is 18913531033.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17985223881 + 15028308100 = 134109^2 + 122590^2 .

It is a cyclic number.

It is not a de Polignac number, because 33013531981 - 2¹³ = 33013523789 is a prime.

It is a super-2 number, since 2×33013531981² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33013531981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33013531181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16506765990 + 16506765991.

It is an arithmetic number, because the mean of its divisors is an integer number (16506765991).

Almost surely, 2^33013531981 is an apocalyptic number.

It is an amenable number.

33013531981 is a deficient number, since it is larger than the sum of its proper divisors (1).

33013531981 is an equidigital number, since it uses as much as digits as its factorization.

33013531981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 33013531981 in words is "thirty-three billion, thirteen million, five hundred thirty-one thousand, nine hundred eighty-one".