1561300026 has 192 divisors, whose sum is σ = 4034790144. Its totient is φ = 398407680.

The previous prime is 1561300019. The next prime is 1561300031. The reversal of 1561300026 is 6200031651.

It is a junction number, because it is equal to n+sod(n) for n = 1561299969 and 1561300005.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5936371 + ... + 5936633.

It is an arithmetic number, because the mean of its divisors is an integer number (21014532).

Almost surely, 2^1561300026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561300026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2017395072).

1561300026 is an abundant number, since it is smaller than the sum of its proper divisors (2473490118).

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

1561300026 is a wasteful number, since it uses less digits than its factorization.

1561300026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1561300026 is about 39513.2892328644. The cubic root of 1561300026 is about 1160.1000770772.

Adding to 1561300026 its reverse (6200031651), we get a palindrome (7761331677).

The spelling of 1561300026 in words is "one billion, five hundred sixty-one million, three hundred thousand, twenty-six".