1656161 has 16 divisors (see below), whose sum is σ = 1935360. Its totient is φ = 1404480.

The previous prime is 1656131. The next prime is 1656163. The reversal of 1656161 is 1616561.

1656161 = T₁₅₀ + T₁₅₁ + ... + T₂₃₆.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1656161 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1656161.

It is not an unprimeable number, because it can be changed into a prime (1656163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8576 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (120960).

2^1656161 is an apocalyptic number.

It is an amenable number.

1656161 is a deficient number, since it is larger than the sum of its proper divisors (279199).

1656161 is a wasteful number, since it uses less digits than its factorization.

1656161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256.

The product of its digits is 1080, while the sum is 26.

The square root of 1656161 is about 1286.9191893821. The cubic root of 1656161 is about 118.3134679783.

The spelling of 1656161 in words is "one million, six hundred fifty-six thousand, one hundred sixty-one".