1561045136 has 40 divisors (see below), whose sum is σ = 3527155200. Its totient is φ = 669016992.

The previous prime is 1561045117. The next prime is 1561045151. The reversal of 1561045136 is 6315401651.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136736 + ... + 147711.

It is an arithmetic number, because the mean of its divisors is an integer number (88178880).

Almost surely, 2^1561045136 is an apocalyptic number.

1561045136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561045136 is an abundant number, since it is smaller than the sum of its proper divisors (1966110064).

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

1561045136 is an equidigital number, since it uses as much as digits as its factorization.

1561045136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284476 (or 284456 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1561045136 is about 39510.0637306497. The cubic root of 1561045136 is about 1160.0369429376.

Adding to 1561045136 its reverse (6315401651), we get a palindrome (7876446787).

The spelling of 1561045136 in words is "one billion, five hundred sixty-one million, forty-five thousand, one hundred thirty-six".