33189250781 has 2 divisors, whose sum is σ = 33189250782. Its totient is φ = 33189250780.

The previous prime is 33189250771. The next prime is 33189250789. The reversal of 33189250781 is 18705298133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22287802681 + 10901448100 = 149291^2 + 104410^2 .

It is an emirp because it is prime and its reverse (18705298133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33189250781 - 2²² = 33185056477 is a prime.

It is a super-2 number, since 2×33189250781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33189250789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16594625390 + 16594625391.

It is an arithmetic number, because the mean of its divisors is an integer number (16594625391).

Almost surely, 2^33189250781 is an apocalyptic number.

It is an amenable number.

33189250781 is a deficient number, since it is larger than the sum of its proper divisors (1).

33189250781 is an equidigital number, since it uses as much as digits as its factorization.

33189250781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 33189250781 in words is "thirty-three billion, one hundred eighty-nine million, two hundred fifty thousand, seven hundred eighty-one".