649897 has 2 divisors, whose sum is σ = 649898. Its totient is φ = 649896.

The previous prime is 649879. The next prime is 649907. The reversal of 649897 is 798946.

Together with previous prime (649879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646416 + 3481 = 804^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 649897 - 2⁷ = 649769 is a prime.

It is a super-2 number, since 2×649897² = 844732221218, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6 + 4³ + 8 + 9³ + 9⁶ + 7⁶ .

It is not a weakly prime, because it can be changed into another prime (649867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324948 + 324949.

It is an arithmetic number, because the mean of its divisors is an integer number (324949).

2⁶⁴⁹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

649897 is a deficient number, since it is larger than the sum of its proper divisors (1).

649897 is an equidigital number, since it uses as much as digits as its factorization.

649897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 649897 is about 806.1618944108. The cubic root of 649897 is about 86.6193347730.

The spelling of 649897 in words is "six hundred forty-nine thousand, eight hundred ninety-seven".