1561117061 has 16 divisors (see below), whose sum is σ = 1834032000. Its totient is φ = 1300743360.

The previous prime is 1561117039. The next prime is 1561117073. The reversal of 1561117061 is 1607111651.

It is not a de Polignac number, because 1561117061 - 2³⁰ = 487375237 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 (1561117091) 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, 386231 + ... + 390251.

It is an arithmetic number, because the mean of its divisors is an integer number (114627000).

Almost surely, 2^1561117061 is an apocalyptic number.

It is an amenable number.

1561117061 is a deficient number, since it is larger than the sum of its proper divisors (272914939).

1561117061 is a wasteful number, since it uses less digits than its factorization.

1561117061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564.

The product of its (nonzero) digits is 1260, while the sum is 29.

The square root of 1561117061 is about 39510.9739313017. The cubic root of 1561117061 is about 1160.0547588597.

The spelling of 1561117061 in words is "one billion, five hundred sixty-one million, one hundred seventeen thousand, sixty-one".