33131109997 has 2 divisors, whose sum is σ = 33131109998. Its totient is φ = 33131109996.

The previous prime is 33131109961. The next prime is 33131110037. The reversal of 33131109997 is 79990113133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31097911716 + 2033198281 = 176346^2 + 45091^2 .

It is a cyclic number.

It is not a de Polignac number, because 33131109997 - 2¹¹ = 33131107949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33131109937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16565554998 + 16565554999.

It is an arithmetic number, because the mean of its divisors is an integer number (16565554999).

Almost surely, 2^33131109997 is an apocalyptic number.

It is an amenable number.

33131109997 is a deficient number, since it is larger than the sum of its proper divisors (1).

33131109997 is an equidigital number, since it uses as much as digits as its factorization.

33131109997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137781, while the sum is 46.

The spelling of 33131109997 in words is "thirty-three billion, one hundred thirty-one million, one hundred nine thousand, nine hundred ninety-seven".