133121233464581 has 2 divisors, whose sum is σ = 133121233464582. Its totient is φ = 133121233464580.

The previous prime is 133121233464511. The next prime is 133121233464589. The reversal of 133121233464581 is 185464332121331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68219422845025 + 64901810619556 = 8259505^2 + 8056166^2 .

It is a cyclic number.

It is not a de Polignac number, because 133121233464581 - 2¹⁸ = 133121233202437 is a prime.

It is a super-2 number, since 2×133121233464581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133121233464589) 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, 66560616732290 + 66560616732291.

It is an arithmetic number, because the mean of its divisors is an integer number (66560616732291).

Almost surely, 2^{133121233464581} is an apocalyptic number.

It is an amenable number.

133121233464581 is a deficient number, since it is larger than the sum of its proper divisors (1).

133121233464581 is an equidigital number, since it uses as much as digits as its factorization.

133121233464581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 47.

The spelling of 133121233464581 in words is "one hundred thirty-three trillion, one hundred twenty-one billion, two hundred thirty-three million, four hundred sixty-four thousand, five hundred eighty-one".