1561875 has 60 divisors (see below), whose sum is σ = 3205224. Its totient is φ = 672000.

The previous prime is 1561829. The next prime is 1561883. The reversal of 1561875 is 5781651.

It is a de Polignac number, because none of the positive numbers 2^k-1561875 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 91867 + ... + 91883.

2^1561875 is an apocalyptic number.

1561875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561875 is an abundant number, since it is smaller than the sum of its proper divisors (1643349).

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

1561875 is an equidigital number, since it uses as much as digits as its factorization.

1561875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54 (or 32 counting only the distinct ones).

The product of its digits is 8400, while the sum is 33.

The square root of 1561875 is about 1249.7499749950. The cubic root of 1561875 is about 116.0242468142.

The spelling of 1561875 in words is "one million, five hundred sixty-one thousand, eight hundred seventy-five".