1561313107 has 4 divisors (see below), whose sum is σ = 1615151520. Its totient is φ = 1507474696.

The previous prime is 1561313093. The next prime is 1561313111. The reversal of 1561313107 is 7013131651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561313107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561313147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26919163 + ... + 26919220.

It is an arithmetic number, because the mean of its divisors is an integer number (403787880).

Almost surely, 2^1561313107 is an apocalyptic number.

1561313107 is a deficient number, since it is larger than the sum of its proper divisors (53838413).

1561313107 is an equidigital number, since it uses as much as digits as its factorization.

1561313107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53838412.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 1561313107 is about 39513.4547591071. The cubic root of 1561313107 is about 1160.1033169471.

Adding to 1561313107 its reverse (7013131651), we get a palindrome (8574444758).

The spelling of 1561313107 in words is "one billion, five hundred sixty-one million, three hundred thirteen thousand, one hundred seven".