648787837 has 2 divisors, whose sum is σ = 648787838. Its totient is φ = 648787836.

The previous prime is 648787831. The next prime is 648787877. The reversal of 648787837 is 738787846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647906116 + 881721 = 25454^2 + 939^2 .

It is a cyclic number.

It is not a de Polignac number, because 648787837 - 2¹¹ = 648785789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648787831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324393918 + 324393919.

It is an arithmetic number, because the mean of its divisors is an integer number (324393919).

Almost surely, 2^648787837 is an apocalyptic number.

It is an amenable number.

648787837 is a deficient number, since it is larger than the sum of its proper divisors (1).

648787837 is an equidigital number, since it uses as much as digits as its factorization.

648787837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12644352, while the sum is 58.

The square root of 648787837 is about 25471.3140022261. The cubic root of 648787837 is about 865.7002969372.

Subtracting 648787837 from its reverse (738787846), we obtain a palindrome (90000009).

The spelling of 648787837 in words is "six hundred forty-eight million, seven hundred eighty-seven thousand, eight hundred thirty-seven".