649097201 has 4 divisors (see below), whose sum is σ = 661344372. Its totient is φ = 636850032.

The previous prime is 649097177. The next prime is 649097219. The reversal of 649097201 is 102790946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102790946 = 2 ⋅51395473.

It can be written as a sum of positive squares in 2 ways, for example, as 176252176 + 472845025 = 13276^2 + 21745^2 .

It is a cyclic number.

It is not a de Polignac number, because 649097201 - 2¹⁰ = 649096177 is a prime.

It is a super-3 number, since 3×649097201³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649097221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6123506 + ... + 6123611.

It is an arithmetic number, because the mean of its divisors is an integer number (165336093).

Almost surely, 2^649097201 is an apocalyptic number.

It is an amenable number.

649097201 is a deficient number, since it is larger than the sum of its proper divisors (12247171).

649097201 is a wasteful number, since it uses less digits than its factorization.

649097201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12247170.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 649097201 is about 25477.3860707883. The cubic root of 649097201 is about 865.8378734734.

The spelling of 649097201 in words is "six hundred forty-nine million, ninety-seven thousand, two hundred one".