1561176061 has 4 divisors (see below), whose sum is σ = 1561610592. Its totient is φ = 1560741532.

The previous prime is 1561176031. The next prime is 1561176073. The reversal of 1561176061 is 1606711651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1606711651 = 4973 ⋅323087.

It is a cyclic number.

It is not a de Polignac number, because 1561176061 - 2⁷ = 1561175933 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 (1561176031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211831 + ... + 219076.

It is an arithmetic number, because the mean of its divisors is an integer number (390402648).

Almost surely, 2^1561176061 is an apocalyptic number.

It is an amenable number.

1561176061 is a deficient number, since it is larger than the sum of its proper divisors (434531).

1561176061 is an equidigital number, since it uses as much as digits as its factorization.

1561176061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434530.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 1561176061 is about 39511.7205522615. The cubic root of 1561176061 is about 1160.0693728329.

The spelling of 1561176061 in words is "one billion, five hundred sixty-one million, one hundred seventy-six thousand, sixty-one".