1561040104 has 16 divisors (see below), whose sum is σ = 3152100420. Its totient is φ = 720480000.

The previous prime is 1561040083. The next prime is 1561040141. The reversal of 1561040104 is 4010401651.

It can be written as a sum of positive squares in 2 ways, for example, as 1561040100 + 4 = 39510^2 + 2^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7504897 + ... + 7505104.

Almost surely, 2^1561040104 is an apocalyptic number.

It is an amenable number.

1561040104 is an abundant number, since it is smaller than the sum of its proper divisors (1591060316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561040104 is a wasteful number, since it uses less digits than its factorization.

1561040104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15010020 (or 15010016 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1561040104 is about 39510.0000506201. Note that the first 4 decimals coincide. The cubic root of 1561040104 is about 1160.0356964838.

Adding to 1561040104 its reverse (4010401651), we get a palindrome (5571441755).

The spelling of 1561040104 in words is "one billion, five hundred sixty-one million, forty thousand, one hundred four".