2131023217 has 2 divisors, whose sum is σ = 2131023218. Its totient is φ = 2131023216.

The previous prime is 2131023187. The next prime is 2131023221. The reversal of 2131023217 is 7123201312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2071979361 + 59043856 = 45519^2 + 7684^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131023217 - 2¹¹ = 2131021169 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131023247) 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, 1065511608 + 1065511609.

It is an arithmetic number, because the mean of its divisors is an integer number (1065511609).

Almost surely, 2^2131023217 is an apocalyptic number.

It is an amenable number.

2131023217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131023217 is an equidigital number, since it uses as much as digits as its factorization.

2131023217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 2131023217 is about 46163.0070186074. The cubic root of 2131023217 is about 1286.8543464836.

Adding to 2131023217 its reverse (7123201312), we get a palindrome (9254224529).

The spelling of 2131023217 in words is "two billion, one hundred thirty-one million, twenty-three thousand, two hundred seventeen".