649604401 has 2 divisors, whose sum is σ = 649604402. Its totient is φ = 649604400.

The previous prime is 649604377. The next prime is 649604413. The reversal of 649604401 is 104406946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 535968801 + 113635600 = 23151^2 + 10660^2 .

It is a cyclic number.

It is not a de Polignac number, because 649604401 - 2¹³ = 649596209 is a prime.

It is a super-3 number, since 3×649604401³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (649604201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324802200 + 324802201.

It is an arithmetic number, because the mean of its divisors is an integer number (324802201).

Almost surely, 2^649604401 is an apocalyptic number.

It is an amenable number.

649604401 is a deficient number, since it is larger than the sum of its proper divisors (1).

649604401 is an equidigital number, since it uses as much as digits as its factorization.

649604401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 649604401 is about 25487.3380524526. The cubic root of 649604401 is about 866.0633346394.

The spelling of 649604401 in words is "six hundred forty-nine million, six hundred four thousand, four hundred one".