1601289 has 20 divisors (see below), whose sum is σ = 2443716. Its totient is φ = 1044576.

The previous prime is 1601287. The next prime is 1601309. The reversal of 1601289 is 9821061.

It can be written as a sum of positive squares in 2 ways, for example, as 1016064 + 585225 = 1008^2 + 765^2 .

It is not a de Polignac number, because 1601289 - 2¹ = 1601287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1601287) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4107 + ... + 4479.

2^1601289 is an apocalyptic number.

It is an amenable number.

1601289 is a deficient number, since it is larger than the sum of its proper divisors (842427).

1601289 is an equidigital number, since it uses as much as digits as its factorization.

1601289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1601289 is about 1265.4204834757. The cubic root of 1601289 is about 116.9921099216.

The spelling of 1601289 in words is "one million, six hundred one thousand, two hundred eighty-nine".