2131543203973 has 2 divisors, whose sum is σ = 2131543203974. Its totient is φ = 2131543203972.

The previous prime is 2131543203931. The next prime is 2131543203989. The reversal of 2131543203973 is 3793023451312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1998768233284 + 132774970689 = 1413778^2 + 364383^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131543203973 - 2¹³ = 2131543195781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131543203173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065771601986 + 1065771601987.

It is an arithmetic number, because the mean of its divisors is an integer number (1065771601987).

Almost surely, 2^{2131543203973} is an apocalyptic number.

It is an amenable number.

2131543203973 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131543203973 is an equidigital number, since it uses as much as digits as its factorization.

2131543203973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 43.

The spelling of 2131543203973 in words is "two trillion, one hundred thirty-one billion, five hundred forty-three million, two hundred three thousand, nine hundred seventy-three".