1561419980 has 24 divisors (see below), whose sum is σ = 3367604688. Its totient is φ = 607687488.

The previous prime is 1561419971. The next prime is 1561419991. The reversal of 1561419980 is 899141651.

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, 1054274 + ... + 1055753.

It is an arithmetic number, because the mean of its divisors is an integer number (140316862).

Almost surely, 2^1561419980 is an apocalyptic number.

1561419980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561419980 is an abundant number, since it is smaller than the sum of its proper divisors (1806184708).

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

1561419980 is a wasteful number, since it uses less digits than its factorization.

1561419980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110073 (or 2110071 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 1561419980 is about 39514.8070980993. The cubic root of 1561419980 is about 1160.1297863107.

The spelling of 1561419980 in words is "one billion, five hundred sixty-one million, four hundred nineteen thousand, nine hundred eighty".