1561145047 has 12 divisors (see below), whose sum is σ = 1981119816. Its totient is φ = 1216476240.

The previous prime is 1561145039. The next prime is 1561145083. The reversal of 1561145047 is 7405411651.

It is not a de Polignac number, because 1561145047 - 2³ = 1561145039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561145017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1447648 + ... + 1448725.

It is an arithmetic number, because the mean of its divisors is an integer number (165093318).

Almost surely, 2^1561145047 is an apocalyptic number.

1561145047 is a deficient number, since it is larger than the sum of its proper divisors (419974769).

1561145047 is a wasteful number, since it uses less digits than its factorization.

1561145047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896398 (or 2896391 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 1561145047 is about 39511.3280844874. The cubic root of 1561145047 is about 1160.0616908828.

Adding to 1561145047 its reverse (7405411651), we get a palindrome (8966556698).

It can be divided in two parts, 156114 and 5047, that added together give a palindrome (161161).

The spelling of 1561145047 in words is "one billion, five hundred sixty-one million, one hundred forty-five thousand, forty-seven".