1605629 has 2 divisors, whose sum is σ = 1605630. Its totient is φ = 1605628.

The previous prime is 1605619. The next prime is 1605631. The reversal of 1605629 is 9265061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 362404 = 1115^2 + 602^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605629 - 2¹² = 1601533 is a prime.

Together with 1605631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802814 + 802815.

It is an arithmetic number, because the mean of its divisors is an integer number (802815).

2^1605629 is an apocalyptic number.

It is an amenable number.

1605629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605629 is an equidigital number, since it uses as much as digits as its factorization.

1605629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1605629 is about 1267.1341681132. The cubic root of 1605629 is about 117.0977097913.

The spelling of 1605629 in words is "one million, six hundred five thousand, six hundred twenty-nine".