1561900204 has 12 divisors (see below), whose sum is σ = 2733847200. Its totient is φ = 780801008.

The previous prime is 1561900201. The next prime is 1561900217. The reversal of 1561900204 is 4020091651.

It is not an unprimeable number, because it can be changed into a prime (1561900201) 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, 11764 + ... + 57115.

It is an arithmetic number, because the mean of its divisors is an integer number (227820600).

Almost surely, 2^1561900204 is an apocalyptic number.

It is an amenable number.

1561900204 is a deficient number, since it is larger than the sum of its proper divisors (1171946996).

1561900204 is a wasteful number, since it uses less digits than its factorization.

1561900204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74552 (or 74550 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1561900204 is about 39520.8831379057. The cubic root of 1561900204 is about 1160.2487090579.

Adding to 1561900204 its reverse (4020091651), we get a palindrome (5581991855).

The spelling of 1561900204 in words is "one billion, five hundred sixty-one million, nine hundred thousand, two hundred four".