649697897 has 2 divisors, whose sum is σ = 649697898. Its totient is φ = 649697896.

The previous prime is 649697833. The next prime is 649697921. The reversal of 649697897 is 798796946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347598736 + 302099161 = 18644^2 + 17381^2 .

It is a cyclic number.

It is not a de Polignac number, because 649697897 - 2⁶ = 649697833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649697827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324848948 + 324848949.

It is an arithmetic number, because the mean of its divisors is an integer number (324848949).

Almost surely, 2^649697897 is an apocalyptic number.

It is an amenable number.

649697897 is a deficient number, since it is larger than the sum of its proper divisors (1).

649697897 is an equidigital number, since it uses as much as digits as its factorization.

649697897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 65.

The square root of 649697897 is about 25489.1721521120. The cubic root of 649697897 is about 866.1048827842.

The spelling of 649697897 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, eight hundred ninety-seven".