649196657 has 2 divisors, whose sum is σ = 649196658. Its totient is φ = 649196656.

The previous prime is 649196627. The next prime is 649196659. The reversal of 649196657 is 756691946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 573315136 + 75881521 = 23944^2 + 8711^2 .

It is a cyclic number.

It is not a de Polignac number, because 649196657 - 2¹⁸ = 648934513 is a prime.

Together with 649196659, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 649196599 and 649196608.

It is not a weakly prime, because it can be changed into another prime (649196659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324598328 + 324598329.

It is an arithmetic number, because the mean of its divisors is an integer number (324598329).

Almost surely, 2^649196657 is an apocalyptic number.

It is an amenable number.

649196657 is a deficient number, since it is larger than the sum of its proper divisors (1).

649196657 is an equidigital number, since it uses as much as digits as its factorization.

649196657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The square root of 649196657 is about 25479.3378446144. The cubic root of 649196657 is about 865.8820930313.

The spelling of 649196657 in words is "six hundred forty-nine million, one hundred ninety-six thousand, six hundred fifty-seven".