12048821581 has 2 divisors, whose sum is σ = 12048821582. Its totient is φ = 12048821580.

The previous prime is 12048821573. The next prime is 12048821593. The reversal of 12048821581 is 18512884021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8884759081 + 3164062500 = 94259^2 + 56250^2 .

It is a cyclic number.

It is not a de Polignac number, because 12048821581 - 2³ = 12048821573 is a prime.

It is a super-2 number, since 2×12048821581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12048821881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6024410790 + 6024410791.

It is an arithmetic number, because the mean of its divisors is an integer number (6024410791).

Almost surely, 2^12048821581 is an apocalyptic number.

It is an amenable number.

12048821581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12048821581 is an equidigital number, since it uses as much as digits as its factorization.

12048821581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40960, while the sum is 40.

The spelling of 12048821581 in words is "twelve billion, forty-eight million, eight hundred twenty-one thousand, five hundred eighty-one".