1561072026 has 16 divisors (see below), whose sum is σ = 3144607200. Its totient is φ = 516613488.

The previous prime is 1561072013. The next prime is 1561072033. The reversal of 1561072026 is 6202701651.

It is a junction number, because it is equal to n+sod(n) for n = 1561071984 and 1561072002.

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, 935061 + ... + 936728.

It is an arithmetic number, because the mean of its divisors is an integer number (196537950).

Almost surely, 2^1561072026 is an apocalyptic number.

1561072026 is an abundant number, since it is smaller than the sum of its proper divisors (1583535174).

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

1561072026 is a wasteful number, since it uses less digits than its factorization.

1561072026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871933.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1561072026 is about 39510.4040222319. The cubic root of 1561072026 is about 1160.0436036919.

Adding to 1561072026 its reverse (6202701651), we get a palindrome (7763773677).

The spelling of 1561072026 in words is "one billion, five hundred sixty-one million, seventy-two thousand, twenty-six".