648516137 has 2 divisors, whose sum is σ = 648516138. Its totient is φ = 648516136.

The previous prime is 648516097. The next prime is 648516139. The reversal of 648516137 is 731615846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544802281 + 103713856 = 23341^2 + 10184^2 .

It is a cyclic number.

It is not a de Polignac number, because 648516137 - 2²⁶ = 581407273 is a prime.

Together with 648516139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 648516094 and 648516103.

It is not a weakly prime, because it can be changed into another prime (648516139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324258068 + 324258069.

It is an arithmetic number, because the mean of its divisors is an integer number (324258069).

Almost surely, 2^648516137 is an apocalyptic number.

It is an amenable number.

648516137 is a deficient number, since it is larger than the sum of its proper divisors (1).

648516137 is an equidigital number, since it uses as much as digits as its factorization.

648516137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 648516137 is about 25465.9799929239. The cubic root of 648516137 is about 865.5794337938.

It can be divided in two parts, 6485 and 16137, that added together give a palindrome (22622).

The spelling of 648516137 in words is "six hundred forty-eight million, five hundred sixteen thousand, one hundred thirty-seven".