5172139909 has 2 divisors, whose sum is σ = 5172139910. Its totient is φ = 5172139908.

The previous prime is 5172139883. The next prime is 5172139933. The reversal of 5172139909 is 9099312715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4640606884 + 531533025 = 68122^2 + 23055^2 .

It is a cyclic number.

It is not a de Polignac number, because 5172139909 - 2⁷ = 5172139781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5172137909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2586069954 + 2586069955.

It is an arithmetic number, because the mean of its divisors is an integer number (2586069955).

Almost surely, 2^5172139909 is an apocalyptic number.

It is an amenable number.

5172139909 is a deficient number, since it is larger than the sum of its proper divisors (1).

5172139909 is an equidigital number, since it uses as much as digits as its factorization.

5172139909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 5172139909 is about 71917.5910956422. The cubic root of 5172139909 is about 1729.3786300219.

The spelling of 5172139909 in words is "five billion, one hundred seventy-two million, one hundred thirty-nine thousand, nine hundred nine".