633649 has 2 divisors, whose sum is σ = 633650. Its totient is φ = 633648.

The previous prime is 633629. The next prime is 633653. The reversal of 633649 is 946336.

633649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 17424 = 785^2 + 132^2 .

It is a cyclic number.

It is not a de Polignac number, because 633649 - 2¹⁵ = 600881 is a prime.

It is a super-2 number, since 2×633649² = 803022110402, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 633649.

It is not a weakly prime, because it can be changed into another prime (633629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316824 + 316825.

It is an arithmetic number, because the mean of its divisors is an integer number (316825).

2⁶³³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

633649 is a deficient number, since it is larger than the sum of its proper divisors (1).

633649 is an equidigital number, since it uses as much as digits as its factorization.

633649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 31.

The square root of 633649 is about 796.0207283733. The cubic root of 633649 is about 85.8913808078.

The spelling of 633649 in words is "six hundred thirty-three thousand, six hundred forty-nine".