1601629 has 2 divisors, whose sum is σ = 1601630. Its totient is φ = 1601628.

The previous prime is 1601627. The next prime is 1601647. The reversal of 1601629 is 9261061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1505529 + 96100 = 1227^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601629 - 2¹ = 1601627 is a prime.

Together with 1601627, 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 (1601623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800814 + 800815.

It is an arithmetic number, because the mean of its divisors is an integer number (800815).

2^1601629 is an apocalyptic number.

It is an amenable number.

1601629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601629 is an equidigital number, since it uses as much as digits as its factorization.

1601629 is an evil number, because the sum of its binary digits is even.

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

The square root of 1601629 is about 1265.5548190418. The cubic root of 1601629 is about 117.0003896059. Note that the first 3 decimals are identical.

It can be divided in two parts, 16016 and 29, that multiplied together give a palindrome (464464).

The spelling of 1601629 in words is "one million, six hundred one thousand, six hundred twenty-nine".