2131534109 has 2 divisors, whose sum is σ = 2131534110. Its totient is φ = 2131534108.

The previous prime is 2131534087. The next prime is 2131534157. The reversal of 2131534109 is 9014351312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1369222009 + 762312100 = 37003^2 + 27610^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131534109 - 2⁸ = 2131533853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131534189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065767054 + 1065767055.

It is an arithmetic number, because the mean of its divisors is an integer number (1065767055).

Almost surely, 2^2131534109 is an apocalyptic number.

It is an amenable number.

2131534109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131534109 is an equidigital number, since it uses as much as digits as its factorization.

2131534109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 2131534109 is about 46168.5402519941. The cubic root of 2131534109 is about 1286.9571751864.

The spelling of 2131534109 in words is "two billion, one hundred thirty-one million, five hundred thirty-four thousand, one hundred nine".