1561885969 has 8 divisors (see below), whose sum is σ = 1786140288. Its totient is φ = 1337913600.

The previous prime is 1561885967. The next prime is 1561885987. The reversal of 1561885969 is 9695881651.

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 1561885969 - 2¹ = 1561885967 is a prime.

It is a super-2 number, since 2×1561885969² = 4878975560318137922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561885967) 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, 58477 + ... + 80890.

It is an arithmetic number, because the mean of its divisors is an integer number (223267536).

Almost surely, 2^1561885969 is an apocalyptic number.

It is an amenable number.

1561885969 is a deficient number, since it is larger than the sum of its proper divisors (224254319).

1561885969 is a wasteful number, since it uses less digits than its factorization.

1561885969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140975.

The product of its digits is 4665600, while the sum is 58.

The square root of 1561885969 is about 39520.7030428357. The cubic root of 1561885969 is about 1160.2451842509.

The spelling of 1561885969 in words is "one billion, five hundred sixty-one million, eight hundred eighty-five thousand, nine hundred sixty-nine".