1561455204 has 48 divisors (see below), whose sum is σ = 3746207808. Its totient is φ = 505830528.

The previous prime is 1561455191. The next prime is 1561455223. The reversal of 1561455204 is 4025541651.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547807 + ... + 550649.

It is an arithmetic number, because the mean of its divisors is an integer number (78045996).

Almost surely, 2^1561455204 is an apocalyptic number.

It is an amenable number.

1561455204 is an abundant number, since it is smaller than the sum of its proper divisors (2184752604).

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

1561455204 is a wasteful number, since it uses less digits than its factorization.

1561455204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124 (or 4122 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 1561455204 is about 39515.2528019245. The cubic root of 1561455204 is about 1160.1385100162.

Adding to 1561455204 its reverse (4025541651), we get a palindrome (5586996855).

The spelling of 1561455204 in words is "one billion, five hundred sixty-one million, four hundred fifty-five thousand, two hundred four".