649921355329 has 3 divisors (see below), whose sum is σ = 649922161507. Its totient is φ = 649920549152.

The previous prime is 649921355287. The next prime is 649921355401. The reversal of 649921355329 is 923553129946.

The square root of 649921355329 is 806177.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 434669897025 + 215251458304 = 659295^2 + 463952^2 .

It is not a de Polignac number, because 649921355329 - 2²⁵ = 649887800897 is a prime.

It is a super-2 number, since 2×649921355329² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649921355429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 403089 + ... + 1209265.

Almost surely, 2^649921355329 is an apocalyptic number.

649921355329 is the 806177-th square number.

649921355329 is the 403089-th centered octagonal number.

It is an amenable number.

649921355329 is a deficient number, since it is larger than the sum of its proper divisors (806178).

649921355329 is an frugal number, since it uses more digits than its factorization.

649921355329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612354 (or 806177 counting only the distinct ones).

The product of its digits is 15746400, while the sum is 58.

The spelling of 649921355329 in words is "six hundred forty-nine billion, nine hundred twenty-one million, three hundred fifty-five thousand, three hundred twenty-nine".