1601599 has 2 divisors, whose sum is σ = 1601600. Its totient is φ = 1601598.

The previous prime is 1601591. The next prime is 1601609. The reversal of 1601599 is 9951061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1601599 - 2³ = 1601591 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1601599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601591) 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, 800799 + 800800.

It is an arithmetic number, because the mean of its divisors is an integer number (800800).

2^1601599 is an apocalyptic number.

1601599 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601599 is an equidigital number, since it uses as much as digits as its factorization.

1601599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1601599 is about 1265.5429664772. The cubic root of 1601599 is about 116.9996590927. Note that the first 3 decimals are identical.

The spelling of 1601599 in words is "one million, six hundred one thousand, five hundred ninety-nine".