1561580 has 12 divisors (see below), whose sum is σ = 3279360. Its totient is φ = 624624.

The previous prime is 1561579. The next prime is 1561589. The reversal of 1561580 is 851651.

It is not an unprimeable number, because it can be changed into a prime (1561589) 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, 39020 + ... + 39059.

It is an arithmetic number, because the mean of its divisors is an integer number (273280).

2^1561580 is an apocalyptic number.

1561580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561580 is an abundant number, since it is smaller than the sum of its proper divisors (1717780).

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

1561580 is a wasteful number, since it uses less digits than its factorization.

1561580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78088 (or 78086 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1561580 is about 1249.6319458144. The cubic root of 1561580 is about 116.0169416397.

The spelling of 1561580 in words is "one million, five hundred sixty-one thousand, five hundred eighty".