1601649 has 12 divisors (see below), whose sum is σ = 2644096. Its totient is φ = 915192.

The previous prime is 1601647. The next prime is 1601653. The reversal of 1601649 is 9461061.

1601649 is a `hidden beast` number, since 16 + 0 + 1 + 649 = 666.

It is not a de Polignac number, because 1601649 - 2¹ = 1601647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1601647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12649 + ... + 12774.

2^1601649 is an apocalyptic number.

It is an amenable number.

1601649 is a deficient number, since it is larger than the sum of its proper divisors (1042447).

1601649 is a wasteful number, since it uses less digits than its factorization.

1601649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25436 (or 25433 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1601649 is about 1265.5627206899. The cubic root of 1601649 is about 117.0008766097. Note that the first 3 decimals are identical.

Adding to 1601649 its product of nonzero digits (1296), we get a triangular number (1602945 = T₁₇₉₀).

The spelling of 1601649 in words is "one million, six hundred one thousand, six hundred forty-nine".