1648928689 has 2 divisors, whose sum is σ = 1648928690. Its totient is φ = 1648928688.

The previous prime is 1648928629. The next prime is 1648928731. The reversal of 1648928689 is 9868298461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1611621025 + 37307664 = 40145^2 + 6108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648928689 - 2²³ = 1640540081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1648928609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824464344 + 824464345.

It is an arithmetic number, because the mean of its divisors is an integer number (824464345).

Almost surely, 2^1648928689 is an apocalyptic number.

It is an amenable number.

1648928689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648928689 is an equidigital number, since it uses as much as digits as its factorization.

1648928689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 61.

The square root of 1648928689 is about 40607.0029551554. The cubic root of 1648928689 is about 1181.4099513570.

The spelling of 1648928689 in words is "one billion, six hundred forty-eight million, nine hundred twenty-eight thousand, six hundred eighty-nine".