1561122036 has 36 divisors (see below), whose sum is σ = 4178298852. Its totient is φ = 489763584.

The previous prime is 1561122011. The next prime is 1561122077. The reversal of 1561122036 is 6302211651.

1561122036 is a `hidden beast` number, since 15 + 611 + 2 + 2 + 0 + 36 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1075184100 + 485937936 = 32790^2 + 22044^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1561122036² = 4874204022569570592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1274815 + ... + 1276038.

It is an arithmetic number, because the mean of its divisors is an integer number (116063857).

Almost surely, 2^1561122036 is an apocalyptic number.

It is an amenable number.

1561122036 is an abundant number, since it is smaller than the sum of its proper divisors (2617176816).

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

1561122036 is a wasteful number, since it uses less digits than its factorization.

1561122036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550880 (or 2550875 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1561122036 is about 39511.0368884442. The cubic root of 1561122036 is about 1160.0559911539.

Adding to 1561122036 its reverse (6302211651), we get a palindrome (7863333687).

The spelling of 1561122036 in words is "one billion, five hundred sixty-one million, one hundred twenty-two thousand, thirty-six".