1561049 has 4 divisors (see below), whose sum is σ = 1784064. Its totient is φ = 1338036.

The previous prime is 1561039. The next prime is 1561069. The reversal of 1561049 is 9401651.

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 de Polignac number, because none of the positive numbers 2^k-1561049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561019) 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, 111497 + ... + 111510.

It is an arithmetic number, because the mean of its divisors is an integer number (446016).

2^1561049 is an apocalyptic number.

It is an amenable number.

1561049 is a deficient number, since it is larger than the sum of its proper divisors (223015).

1561049 is an equidigital number, since it uses as much as digits as its factorization.

1561049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223014.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1561049 is about 1249.4194651917. The cubic root of 1561049 is about 116.0037900070.

The spelling of 1561049 in words is "one million, five hundred sixty-one thousand, forty-nine".