2145240017 has 2 divisors, whose sum is σ = 2145240018. Its totient is φ = 2145240016.

The previous prime is 2145239981. The next prime is 2145240043. The reversal of 2145240017 is 7100425412.

It is an a-pointer prime, because the next prime (2145240043) can be obtained adding 2145240017 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2138970001 + 6270016 = 46249^2 + 2504^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145240017 - 2⁶ = 2145239953 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145240077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072620008 + 1072620009.

It is an arithmetic number, because the mean of its divisors is an integer number (1072620009).

Almost surely, 2^2145240017 is an apocalyptic number.

It is an amenable number.

2145240017 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145240017 is an equidigital number, since it uses as much as digits as its factorization.

2145240017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 2145240017 is about 46316.7358197876. The cubic root of 2145240017 is about 1289.7096910970.

Adding to 2145240017 its reverse (7100425412), we get a palindrome (9245665429).

The spelling of 2145240017 in words is "two billion, one hundred forty-five million, two hundred forty thousand, seventeen".