1561454047 has 4 divisors (see below), whose sum is σ = 1615297320. Its totient is φ = 1507610776.

The previous prime is 1561453997. The next prime is 1561454051. The reversal of 1561454047 is 7404541651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7404541651 = 13 ⋅569580127.

It is a cyclic number.

It is not a de Polignac number, because 1561454047 - 2⁷ = 1561453919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561453997 and 1561454015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561454747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26921593 + ... + 26921650.

It is an arithmetic number, because the mean of its divisors is an integer number (403824330).

Almost surely, 2^1561454047 is an apocalyptic number.

1561454047 is a deficient number, since it is larger than the sum of its proper divisors (53843273).

1561454047 is an equidigital number, since it uses as much as digits as its factorization.

1561454047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53843272.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 1561454047 is about 39515.2381620053. The cubic root of 1561454047 is about 1160.1382234714.

Adding to 1561454047 its reverse (7404541651), we get a palindrome (8965995698).

The spelling of 1561454047 in words is "one billion, five hundred sixty-one million, four hundred fifty-four thousand, forty-seven".