1355561 has 4 divisors (see below), whose sum is σ = 1372800. Its totient is φ = 1338324.

The previous prime is 1355533. The next prime is 1355573. The reversal of 1355561 is 1655531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1355561.

It is not an unprimeable number, because it can be changed into a prime (1355591) 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 3 ways as a sum of consecutive naturals, for example, 8501 + ... + 8658.

It is an arithmetic number, because the mean of its divisors is an integer number (343200).

2^1355561 is an apocalyptic number.

It is an amenable number.

1355561 is a deficient number, since it is larger than the sum of its proper divisors (17239).

1355561 is an equidigital number, since it uses as much as digits as its factorization.

1355561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17238.

The product of its digits is 2250, while the sum is 26.

The square root of 1355561 is about 1164.2856178790. The cubic root of 1355561 is about 110.6724918709.

The spelling of 1355561 in words is "one million, three hundred fifty-five thousand, five hundred sixty-one".