1601555 has 16 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 1224960.

The previous prime is 1601543. The next prime is 1601563. The reversal of 1601555 is 5551061.

It is not a de Polignac number, because 1601555 - 2¹⁰ = 1600531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1601555.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17951 + ... + 18039.

It is an arithmetic number, because the mean of its divisors is an integer number (125550).

2^1601555 is an apocalyptic number.

1601555 is a deficient number, since it is larger than the sum of its proper divisors (407245).

1601555 is an equidigital number, since it uses as much as digits as its factorization.

1601555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1601555 is about 1265.5255825150. The cubic root of 1601555 is about 116.9985876568.

The spelling of 1601555 in words is "one million, six hundred one thousand, five hundred fifty-five".