1536561 has 24 divisors (see below), whose sum is σ = 2498496. Its totient is φ = 902880.

The previous prime is 1536553. The next prime is 1536581. The reversal of 1536561 is 1656351.

It is a happy number.

1536561 is a `hidden beast` number, since 1 + 5 + 3 + 656 + 1 = 666.

It is not a de Polignac number, because 1536561 - 2³ = 1536553 is a prime.

It is a super-2 number, since 2×1536561² = 4722039413442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1536581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2406 + ... + 2976.

It is an arithmetic number, because the mean of its divisors is an integer number (104104).

2^1536561 is an apocalyptic number.

It is an amenable number.

1536561 is a deficient number, since it is larger than the sum of its proper divisors (961935).

1536561 is a wasteful number, since it uses less digits than its factorization.

1536561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 610 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 1536561 is about 1239.5809775888. The cubic root of 1536561 is about 115.3940108247.

The spelling of 1536561 in words is "one million, five hundred thirty-six thousand, five hundred sixty-one".