20131055089861 has 2 divisors, whose sum is σ = 20131055089862. Its totient is φ = 20131055089860.

The previous prime is 20131055089843. The next prime is 20131055089913. The reversal of 20131055089861 is 16898055013102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20130521757025 + 533332836 = 4486705^2 + 23094^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131055089861 - 2¹¹ = 20131055087813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20131055089361) 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, 10065527544930 + 10065527544931.

It is an arithmetic number, because the mean of its divisors is an integer number (10065527544931).

Almost surely, 2^{20131055089861} is an apocalyptic number.

It is an amenable number.

20131055089861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131055089861 is an equidigital number, since it uses as much as digits as its factorization.

20131055089861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 49.

The spelling of 20131055089861 in words is "twenty trillion, one hundred thirty-one billion, fifty-five million, eighty-nine thousand, eight hundred sixty-one".