601636649 has 2 divisors, whose sum is σ = 601636650. Its totient is φ = 601636648.

The previous prime is 601636643. The next prime is 601636663. The reversal of 601636649 is 946636106.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594384400 + 7252249 = 24380^2 + 2693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-601636649 is a prime.

It is not a weakly prime, because it can be changed into another prime (601636643) 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 as a sum of consecutive naturals, namely, 300818324 + 300818325.

It is an arithmetic number, because the mean of its divisors is an integer number (300818325).

Almost surely, 2^601636649 is an apocalyptic number.

It is an amenable number.

601636649 is a deficient number, since it is larger than the sum of its proper divisors (1).

601636649 is an equidigital number, since it uses as much as digits as its factorization.

601636649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 601636649 is about 24528.2826345425. The cubic root of 601636649 is about 844.1988597439.

The spelling of 601636649 in words is "six hundred one million, six hundred thirty-six thousand, six hundred forty-nine".