3811745284981 has 2 divisors, whose sum is σ = 3811745284982. Its totient is φ = 3811745284980.

The previous prime is 3811745284901. The next prime is 3811745284999. The reversal of 3811745284981 is 1894825471183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3041623200625 + 770122084356 = 1744025^2 + 877566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3811745284981 is a prime.

It is a super-2 number, since 2×3811745284981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3811745284901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1905872642490 + 1905872642491.

It is an arithmetic number, because the mean of its divisors is an integer number (1905872642491).

Almost surely, 2^{3811745284981} is an apocalyptic number.

It is an amenable number.

3811745284981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3811745284981 is an equidigital number, since it uses as much as digits as its factorization.

3811745284981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15482880, while the sum is 61.

The spelling of 3811745284981 in words is "three trillion, eight hundred eleven billion, seven hundred forty-five million, two hundred eighty-four thousand, nine hundred eighty-one".