1561443 has 8 divisors (see below), whose sum is σ = 2242128. Its totient is φ = 960864.

The previous prime is 1561429. The next prime is 1561453. The reversal of 1561443 is 3441651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561443 - 2⁸ = 1561187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561423) 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 7 ways as a sum of consecutive naturals, for example, 19980 + ... + 20057.

It is an arithmetic number, because the mean of its divisors is an integer number (280266).

2^1561443 is an apocalyptic number.

1561443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1561443 is a deficient number, since it is larger than the sum of its proper divisors (680685).

1561443 is a wasteful number, since it uses less digits than its factorization.

1561443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40053.

The product of its digits is 1440, while the sum is 24.

The square root of 1561443 is about 1249.5771284719. The cubic root of 1561443 is about 116.0135487543.

The spelling of 1561443 in words is "one million, five hundred sixty-one thousand, four hundred forty-three".