1561765252 has 6 divisors (see below), whose sum is σ = 2733089198. Its totient is φ = 780882624.

The previous prime is 1561765237. The next prime is 1561765253. The reversal of 1561765252 is 2525671651.

It can be written as a sum of positive squares in only one way, i.e., 1544175616 + 17589636 = 39296^2 + 4194^2 .

It is a super-2 number, since 2×1561765252² = 4878221404709247008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1561765253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195220653 + ... + 195220660.

Almost surely, 2^1561765252 is an apocalyptic number.

It is an amenable number.

1561765252 is a deficient number, since it is larger than the sum of its proper divisors (1171323946).

1561765252 is a wasteful number, since it uses less digits than its factorization.

1561765252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390441317 (or 390441315 counting only the distinct ones).

The product of its digits is 126000, while the sum is 40.

The square root of 1561765252 is about 39519.1757505138. The cubic root of 1561765252 is about 1160.2152919862.

The spelling of 1561765252 in words is "one billion, five hundred sixty-one million, seven hundred sixty-five thousand, two hundred fifty-two".