1601656 has 32 divisors (see below), whose sum is σ = 3529440. Its totient is φ = 667008.

The previous prime is 1601653. The next prime is 1601659. The reversal of 1601656 is 6561061.

1601656 = T₁₁₀ + T₁₁₁ + ... + T₂₂₁.

It is an interprime number because it is at equal distance from previous prime (1601653) and next prime (1601659).

It is an Ulam number.

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 1601656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1686 + ... + 2458.

It is an arithmetic number, because the mean of its divisors is an integer number (110295).

2^1601656 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 1601656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1764720).

1601656 is an abundant number, since it is smaller than the sum of its proper divisors (1927784).

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

1601656 is a wasteful number, since it uses less digits than its factorization.

1601656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1601656 is about 1265.5654862551. The cubic root of 1601656 is about 117.0010470601.

The spelling of 1601656 in words is "one million, six hundred one thousand, six hundred fifty-six".