648889537 has 2 divisors, whose sum is σ = 648889538. Its totient is φ = 648889536.

The previous prime is 648889523. The next prime is 648889583. The reversal of 648889537 is 735988846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585591601 + 63297936 = 24199^2 + 7956^2 .

It is a cyclic number.

It is not a de Polignac number, because 648889537 - 2¹¹ = 648887489 is a prime.

It is not a weakly prime, because it can be changed into another prime (648889517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324444768 + 324444769.

It is an arithmetic number, because the mean of its divisors is an integer number (324444769).

Almost surely, 2^648889537 is an apocalyptic number.

It is an amenable number.

648889537 is a deficient number, since it is larger than the sum of its proper divisors (1).

648889537 is an equidigital number, since it uses as much as digits as its factorization.

648889537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 58.

The square root of 648889537 is about 25473.3102874361. The cubic root of 648889537 is about 865.7455285293.

The spelling of 648889537 in words is "six hundred forty-eight million, eight hundred eighty-nine thousand, five hundred thirty-seven".