1561047 has 4 divisors (see below), whose sum is σ = 2081400. Its totient is φ = 1040696.

The previous prime is 1561039. The next prime is 1561069. The reversal of 1561047 is 7401651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7401651 = 3 ⋅2467217.

It is a cyclic number.

It is not a de Polignac number, because 1561047 - 2³ = 1561039 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260172 + ... + 260177.

It is an arithmetic number, because the mean of its divisors is an integer number (520350).

2^1561047 is an apocalyptic number.

1561047 is a deficient number, since it is larger than the sum of its proper divisors (520353).

1561047 is an equidigital number, since it uses as much as digits as its factorization.

1561047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520352.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1561047 is about 1249.4186648198. The cubic root of 1561047 is about 116.0037404660.

Adding to 1561047 its reverse (7401651), we get a palindrome (8962698).

The spelling of 1561047 in words is "one million, five hundred sixty-one thousand, forty-seven".