1561310045 has 8 divisors (see below), whose sum is σ = 1901536224. Its totient is φ = 1230405264.

The previous prime is 1561310041. The next prime is 1561310077. The reversal of 1561310045 is 5400131651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1561310045 - 2² = 1561310041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561309996 and 1561310023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561310041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2329979 + ... + 2330648.

It is an arithmetic number, because the mean of its divisors is an integer number (237692028).

Almost surely, 2^1561310045 is an apocalyptic number.

It is an amenable number.

1561310045 is a deficient number, since it is larger than the sum of its proper divisors (340226179).

1561310045 is an equidigital number, since it uses as much as digits as its factorization.

1561310045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660699.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1561310045 is about 39513.4160127924. The cubic root of 1561310045 is about 1160.1025585601.

Adding to 1561310045 its reverse (5400131651), we get a palindrome (6961441696).

The spelling of 1561310045 in words is "one billion, five hundred sixty-one million, three hundred ten thousand, forty-five".