1356561 has 16 divisors (see below), whose sum is σ = 2054400. Its totient is φ = 884304.

The previous prime is 1356547. The next prime is 1356571. The reversal of 1356561 is 1656531.

It is a happy number.

1356561 is a `hidden beast` number, since 1 + 3 + 5 + 656 + 1 = 666.

It is not a de Polignac number, because 1356561 - 2⁶ = 1356497 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 (1356571) 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, 735 + ... + 1803.

It is an arithmetic number, because the mean of its divisors is an integer number (128400).

2^1356561 is an apocalyptic number.

It is an amenable number.

1356561 is a deficient number, since it is larger than the sum of its proper divisors (697839).

1356561 is a wasteful number, since it uses less digits than its factorization.

1356561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125 (or 1119 counting only the distinct ones).

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

The square root of 1356561 is about 1164.7149865954. The cubic root of 1356561 is about 110.6996996195.

The spelling of 1356561 in words is "one million, three hundred fifty-six thousand, five hundred sixty-one".