1601609 has 2 divisors, whose sum is σ = 1601610. Its totient is φ = 1601608.

The previous prime is 1601599. The next prime is 1601617. The reversal of 1601609 is 9061061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 64009 = 1240^2 + 253^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601609 - 2¹² = 1597513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1601629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800804 + 800805.

It is an arithmetic number, because the mean of its divisors is an integer number (800805).

2^1601609 is an apocalyptic number.

It is an amenable number.

1601609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601609 is an equidigital number, since it uses as much as digits as its factorization.

1601609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1601609 is about 1265.5469173444. The cubic root of 1601609 is about 116.9999025981. Note that the first 4 decimals are identical.

The spelling of 1601609 in words is "one million, six hundred one thousand, six hundred nine".