1561061 has 4 divisors (see below), whose sum is σ = 1564800. Its totient is φ = 1557324.

The previous prime is 1561039. The next prime is 1561069. The reversal of 1561061 is 1601651.

It is a happy number.

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 not a de Polignac number, because 1561061 - 2⁶ = 1560997 is a prime.

It is a super-2 number, since 2×1561061² = 4873822891442, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (391200).

2^1561061 is an apocalyptic number.

It is an amenable number.

1561061 is a deficient number, since it is larger than the sum of its proper divisors (3739).

1561061 is an equidigital number, since it uses as much as digits as its factorization.

1561061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1561061 is about 1249.4242674128. The cubic root of 1561061 is about 116.0040872519.

The spelling of 1561061 in words is "one million, five hundred sixty-one thousand, sixty-one".