1601556 has 36 divisors (see below), whose sum is σ = 4111296. Its totient is φ = 484880.

The previous prime is 1601543. The next prime is 1601563. The reversal of 1601556 is 6551061.

It is a super-2 number, since 2×1601556² = 5129963242272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 901 + ... + 2003.

2^1601556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1601556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2055648).

1601556 is an abundant number, since it is smaller than the sum of its proper divisors (2509740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1601556 is a wasteful number, since it uses less digits than its factorization.

1601556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1601556 is about 1265.5259776077. The cubic root of 1601556 is about 116.9986120078.

The spelling of 1601556 in words is "one million, six hundred one thousand, five hundred fifty-six".