1561264873 has 16 divisors (see below), whose sum is σ = 1845310464. Its totient is φ = 1292633280.

The previous prime is 1561264849. The next prime is 1561264877. The reversal of 1561264873 is 3784621651.

It is a cyclic number.

It is not a de Polignac number, because 1561264873 - 2⁹ = 1561264361 is a prime.

It is a super-2 number, since 2×1561264873² = 4875096007327412258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1561264877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114411 + ... + 127327.

It is an arithmetic number, because the mean of its divisors is an integer number (115331904).

Almost surely, 2^1561264873 is an apocalyptic number.

It is an amenable number.

1561264873 is a deficient number, since it is larger than the sum of its proper divisors (284045591).

1561264873 is a wasteful number, since it uses less digits than its factorization.

1561264873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13512.

The product of its digits is 241920, while the sum is 43.

The square root of 1561264873 is about 39512.8444053323. The cubic root of 1561264873 is about 1160.0913703791.

The spelling of 1561264873 in words is "one billion, five hundred sixty-one million, two hundred sixty-four thousand, eight hundred seventy-three".