2131243187 has 2 divisors, whose sum is σ = 2131243188. Its totient is φ = 2131243186.

The previous prime is 2131243157. The next prime is 2131243307. The reversal of 2131243187 is 7813421312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2131243187 - 2⁶ = 2131243123 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131243157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065621593 + 1065621594.

It is an arithmetic number, because the mean of its divisors is an integer number (1065621594).

Almost surely, 2^2131243187 is an apocalyptic number.

2131243187 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131243187 is an equidigital number, since it uses as much as digits as its factorization.

2131243187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 2131243187 is about 46165.3894925625. The cubic root of 2131243187 is about 1286.8986224929.

Adding to 2131243187 its reverse (7813421312), we get a palindrome (9944664499).

The spelling of 2131243187 in words is "two billion, one hundred thirty-one million, two hundred forty-three thousand, one hundred eighty-seven".