1561203272 has 8 divisors (see below), whose sum is σ = 2927256150. Its totient is φ = 780601632.

The previous prime is 1561203251. The next prime is 1561203283. The reversal of 1561203272 is 2723021651.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1532409316 + 28793956 = 39146^2 + 5366^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97575197 + ... + 97575212.

Almost surely, 2^1561203272 is an apocalyptic number.

It is an amenable number.

1561203272 is a deficient number, since it is larger than the sum of its proper divisors (1366052878).

1561203272 is a wasteful number, since it uses less digits than its factorization.

1561203272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195150415 (or 195150411 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1561203272 is about 39512.0648916252. The cubic root of 1561203272 is about 1160.0761127228.

The spelling of 1561203272 in words is "one billion, five hundred sixty-one million, two hundred three thousand, two hundred seventy-two".