1302561 has 20 divisors (see below), whose sum is σ = 2097172. Its totient is φ = 800928.

The previous prime is 1302493. The next prime is 1302563. The reversal of 1302561 is 1652031.

It can be written as a sum of positive squares in 2 ways, for example, as 571536 + 731025 = 756^2 + 855^2 .

It is not a de Polignac number, because 1302561 - 2¹³ = 1294369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1302563) 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, 435 + ... + 1671.

2^1302561 is an apocalyptic number.

It is an amenable number.

1302561 is a deficient number, since it is larger than the sum of its proper divisors (794611).

1302561 is a wasteful number, since it uses less digits than its factorization.

1302561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262 (or 1253 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1302561 is about 1141.2979453237. The cubic root of 1302561 is about 109.2109094281.

Adding to 1302561 its reverse (1652031), we get a palindrome (2954592).

The spelling of 1302561 in words is "one million, three hundred two thousand, five hundred sixty-one".