649923893 has 2 divisors, whose sum is σ = 649923894. Its totient is φ = 649923892.

The previous prime is 649923877. The next prime is 649923917. The reversal of 649923893 is 398329946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641203684 + 8720209 = 25322^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 649923893 - 2⁴ = 649923877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649923803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324961946 + 324961947.

It is an arithmetic number, because the mean of its divisors is an integer number (324961947).

Almost surely, 2^649923893 is an apocalyptic number.

It is an amenable number.

649923893 is a deficient number, since it is larger than the sum of its proper divisors (1).

649923893 is an equidigital number, since it uses as much as digits as its factorization.

649923893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 53.

The square root of 649923893 is about 25493.6049432010. The cubic root of 649923893 is about 866.2052953753.

The spelling of 649923893 in words is "six hundred forty-nine million, nine hundred twenty-three thousand, eight hundred ninety-three".