1561083020 has 24 divisors (see below), whose sum is σ = 3746599584. Its totient is φ = 535228416.

The previous prime is 1561083011. The next prime is 1561083023. The reversal of 1561083020 is 203801651.

It is not an unprimeable number, because it can be changed into a prime (1561083023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5575157 + ... + 5575436.

It is an arithmetic number, because the mean of its divisors is an integer number (156108316).

Almost surely, 2^1561083020 is an apocalyptic number.

1561083020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561083020 is an abundant number, since it is smaller than the sum of its proper divisors (2185516564).

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

1561083020 is a wasteful number, since it uses less digits than its factorization.

1561083020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11150609 (or 11150607 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1561083020 is about 39510.5431498986. The cubic root of 1561083020 is about 1160.0463269251.

Adding to 1561083020 its reverse (203801651), we get a palindrome (1764884671).

The spelling of 1561083020 in words is "one billion, five hundred sixty-one million, eighty-three thousand, twenty".