52122121161581 has 2 divisors, whose sum is σ = 52122121161582. Its totient is φ = 52122121161580.

The previous prime is 52122121161571. The next prime is 52122121161641. The reversal of 52122121161581 is 18516112122125.

52122121161581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50920126875556 + 1201994286025 = 7135834^2 + 1096355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52122121161581 is a prime.

It is a super-2 number, since 2×52122121161581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52122121161571) 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, 26061060580790 + 26061060580791.

It is an arithmetic number, because the mean of its divisors is an integer number (26061060580791).

Almost surely, 2^{52122121161581} is an apocalyptic number.

It is an amenable number.

52122121161581 is a deficient number, since it is larger than the sum of its proper divisors (1).

52122121161581 is an equidigital number, since it uses as much as digits as its factorization.

52122121161581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 38.

The spelling of 52122121161581 in words is "fifty-two trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred sixty-one thousand, five hundred eighty-one".