43121130361 has 2 divisors, whose sum is σ = 43121130362. Its totient is φ = 43121130360.

The previous prime is 43121130359. The next prime is 43121130443. The reversal of 43121130361 is 16303112134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31917966336 + 11203164025 = 178656^2 + 105845^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121130361 - 2¹ = 43121130359 is a prime.

It is a super-2 number, since 2×43121130361² (a number of 22 digits) contains 22 as substring.

Together with 43121130359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43121130461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560565180 + 21560565181.

It is an arithmetic number, because the mean of its divisors is an integer number (21560565181).

Almost surely, 2^43121130361 is an apocalyptic number.

It is an amenable number.

43121130361 is a deficient number, since it is larger than the sum of its proper divisors (1).

43121130361 is an equidigital number, since it uses as much as digits as its factorization.

43121130361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 43121130361 its reverse (16303112134), we get a palindrome (59424242495).

The spelling of 43121130361 in words is "forty-three billion, one hundred twenty-one million, one hundred thirty thousand, three hundred sixty-one".