1561879 has 8 divisors (see below), whose sum is σ = 1721088. Its totient is φ = 1405560.

The previous prime is 1561829. The next prime is 1561883. The reversal of 1561879 is 9781651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1561879 - 2⁹ = 1561367 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561829) by changing a digit.

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, 514 + ... + 1840.

It is an arithmetic number, because the mean of its divisors is an integer number (215136).

2^1561879 is an apocalyptic number.

1561879 is a deficient number, since it is larger than the sum of its proper divisors (159209).

1561879 is a wasteful number, since it uses less digits than its factorization.

1561879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445.

The product of its digits is 15120, while the sum is 37.

The square root of 1561879 is about 1249.7515753141. The cubic root of 1561879 is about 116.0243458610.

The spelling of 1561879 in words is "one million, five hundred sixty-one thousand, eight hundred seventy-nine".