3631729 has 2 divisors, whose sum is σ = 3631730. Its totient is φ = 3631728.

The previous prime is 3631703. The next prime is 3631741. The reversal of 3631729 is 9271363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 2704 = 1905^2 + 52^2 .

It is a cyclic number.

It is not a de Polignac number, because 3631729 - 2¹³ = 3623537 is a prime.

3631729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3631729.

It is not a weakly prime, because it can be changed into another prime (3631759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1815864 + 1815865.

It is an arithmetic number, because the mean of its divisors is an integer number (1815865).

Almost surely, 2^3631729 is an apocalyptic number.

It is an amenable number.

3631729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3631729 is an equidigital number, since it uses as much as digits as its factorization.

3631729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

The square root of 3631729 is about 1905.7095791332. The cubic root of 3631729 is about 153.7108336572.

The spelling of 3631729 in words is "three million, six hundred thirty-one thousand, seven hundred twenty-nine".