1561340061 has 24 divisors (see below), whose sum is σ = 2423588544. Its totient is φ = 965036160.

The previous prime is 1561340057. The next prime is 1561340107. The reversal of 1561340061 is 1600431651.

1561340061 is a `hidden beast` number, since 1 + 5 + 613 + 40 + 0 + 6 + 1 = 666.

It is not a de Polignac number, because 1561340061 - 2² = 1561340057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561340461) 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 23 ways as a sum of consecutive naturals, for example, 65905 + ... + 86406.

It is an arithmetic number, because the mean of its divisors is an integer number (100982856).

Almost surely, 2^1561340061 is an apocalyptic number.

It is an amenable number.

1561340061 is a deficient number, since it is larger than the sum of its proper divisors (862248483).

1561340061 is a wasteful number, since it uses less digits than its factorization.

1561340061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152401 (or 152398 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1561340061 is about 39513.7958313296. The cubic root of 1561340061 is about 1160.1099927904.

The spelling of 1561340061 in words is "one billion, five hundred sixty-one million, three hundred forty thousand, sixty-one".