4001261240881 has 2 divisors, whose sum is σ = 4001261240882. Its totient is φ = 4001261240880.

The previous prime is 4001261240857. The next prime is 4001261240887. The reversal of 4001261240881 is 1880421621004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2747253210256 + 1254008030625 = 1657484^2 + 1119825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4001261240881 is a prime.

It is a super-2 number, since 2×4001261240881² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4001261240881.

It is not a weakly prime, because it can be changed into another prime (4001261240887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000630620440 + 2000630620441.

It is an arithmetic number, because the mean of its divisors is an integer number (2000630620441).

Almost surely, 2^{4001261240881} is an apocalyptic number.

It is an amenable number.

4001261240881 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001261240881 is an equidigital number, since it uses as much as digits as its factorization.

4001261240881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 37.

Adding to 4001261240881 its reverse (1880421621004), we get a palindrome (5881682861885).

The spelling of 4001261240881 in words is "four trillion, one billion, two hundred sixty-one million, two hundred forty thousand, eight hundred eighty-one".