1629601 has 2 divisors, whose sum is σ = 1629602. Its totient is φ = 1629600.

The previous prime is 1629599. The next prime is 1629623. The reversal of 1629601 is 1069261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 950625 + 678976 = 975^2 + 824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1629601 - 2¹ = 1629599 is a prime.

Together with 1629599, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1629101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814800 + 814801.

It is an arithmetic number, because the mean of its divisors is an integer number (814801).

2^1629601 is an apocalyptic number.

It is an amenable number.

1629601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1629601 is an equidigital number, since it uses as much as digits as its factorization.

1629601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1629601 is about 1276.5582634569. The cubic root of 1629601 is about 117.6775887090.

The spelling of 1629601 in words is "one million, six hundred twenty-nine thousand, six hundred one".