3121320187 has 2 divisors, whose sum is σ = 3121320188. Its totient is φ = 3121320186.

The previous prime is 3121320113. The next prime is 3121320193. The reversal of 3121320187 is 7810231213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3121320187 - 2¹¹ = 3121318139 is a prime.

It is not a weakly prime, because it can be changed into another prime (3121320287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560660093 + 1560660094.

It is an arithmetic number, because the mean of its divisors is an integer number (1560660094).

Almost surely, 2^3121320187 is an apocalyptic number.

3121320187 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121320187 is an equidigital number, since it uses as much as digits as its factorization.

3121320187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 3121320187 is about 55868.7764945681. The cubic root of 3121320187 is about 1461.4347856594.

The spelling of 3121320187 in words is "three billion, one hundred twenty-one million, three hundred twenty thousand, one hundred eighty-seven".