1561547473 has 2 divisors, whose sum is σ = 1561547474. Its totient is φ = 1561547472.

The previous prime is 1561547467. The next prime is 1561547503. The reversal of 1561547473 is 3747451651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1383244864 + 178302609 = 37192^2 + 13353^2 .

It is an emirp because it is prime and its reverse (3747451651) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561547473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561547173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780773736 + 780773737.

It is an arithmetic number, because the mean of its divisors is an integer number (780773737).

Almost surely, 2^1561547473 is an apocalyptic number.

It is an amenable number.

1561547473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561547473 is an equidigital number, since it uses as much as digits as its factorization.

1561547473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 43.

The square root of 1561547473 is about 39516.4202958719. The cubic root of 1561547473 is about 1160.1613610745.

The spelling of 1561547473 in words is "one billion, five hundred sixty-one million, five hundred forty-seven thousand, four hundred seventy-three".