649309877 has 2 divisors, whose sum is σ = 649309878. Its totient is φ = 649309876.

The previous prime is 649309831. The next prime is 649309891. The reversal of 649309877 is 778903946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570206641 + 79103236 = 23879^2 + 8894^2 .

It is a cyclic number.

It is not a de Polignac number, because 649309877 - 2⁶ = 649309813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649300877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324654938 + 324654939.

It is an arithmetic number, because the mean of its divisors is an integer number (324654939).

Almost surely, 2^649309877 is an apocalyptic number.

It is an amenable number.

649309877 is a deficient number, since it is larger than the sum of its proper divisors (1).

649309877 is an equidigital number, since it uses as much as digits as its factorization.

649309877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 649309877 is about 25481.5595480339. The cubic root of 649309877 is about 865.9324267635.

The spelling of 649309877 in words is "six hundred forty-nine million, three hundred nine thousand, eight hundred seventy-seven".