649583401 has 2 divisors, whose sum is σ = 649583402. Its totient is φ = 649583400.

The previous prime is 649583399. The next prime is 649583483. The reversal of 649583401 is 104385946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352538176 + 297045225 = 18776^2 + 17235^2 .

It is a cyclic number.

It is not a de Polignac number, because 649583401 - 2¹ = 649583399 is a prime.

Together with 649583399, it forms a pair of twin primes.

It is equal to p_33772909 and since 649583401 and 33772909 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (649583491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324791700 + 324791701.

It is an arithmetic number, because the mean of its divisors is an integer number (324791701).

Almost surely, 2^649583401 is an apocalyptic number.

It is an amenable number.

649583401 is a deficient number, since it is larger than the sum of its proper divisors (1).

649583401 is an equidigital number, since it uses as much as digits as its factorization.

649583401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 649583401 is about 25486.9260798551. The cubic root of 649583401 is about 866.0540020230.

The spelling of 649583401 in words is "six hundred forty-nine million, five hundred eighty-three thousand, four hundred one".