1561335473 has 16 divisors (see below), whose sum is σ = 1673070336. Its totient is φ = 1453436160.

The previous prime is 1561335439. The next prime is 1561335481. The reversal of 1561335473 is 3745331651.

It is a cyclic number.

It is not a de Polignac number, because 1561335473 - 2¹⁶ = 1561269937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561335173) 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 15 ways as a sum of consecutive naturals, for example, 429140 + ... + 432762.

It is an arithmetic number, because the mean of its divisors is an integer number (104566896).

Almost surely, 2^1561335473 is an apocalyptic number.

It is an amenable number.

1561335473 is a deficient number, since it is larger than the sum of its proper divisors (111734863).

1561335473 is a wasteful number, since it uses less digits than its factorization.

1561335473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144.

The product of its digits is 113400, while the sum is 38.

The square root of 1561335473 is about 39513.7377756142. The cubic root of 1561335473 is about 1160.1088564610.

The spelling of 1561335473 in words is "one billion, five hundred sixty-one million, three hundred thirty-five thousand, four hundred seventy-three".