2151123017 has 2 divisors, whose sum is σ = 2151123018. Its totient is φ = 2151123016.

The previous prime is 2151123011. The next prime is 2151123041. The reversal of 2151123017 is 7103211512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1665537721 + 485585296 = 40811^2 + 22036^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151123017 - 2²⁰ = 2150074441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151122983 and 2151123001.

It is not a weakly prime, because it can be changed into another prime (2151123011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075561508 + 1075561509.

It is an arithmetic number, because the mean of its divisors is an integer number (1075561509).

Almost surely, 2^2151123017 is an apocalyptic number.

It is an amenable number.

2151123017 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151123017 is an equidigital number, since it uses as much as digits as its factorization.

2151123017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 2151123017 is about 46380.2007002988. The cubic root of 2151123017 is about 1290.8875603743.

Adding to 2151123017 its reverse (7103211512), we get a palindrome (9254334529).

The spelling of 2151123017 in words is "two billion, one hundred fifty-one million, one hundred twenty-three thousand, seventeen".