1516789561 has 8 divisors (see below), whose sum is σ = 1768851200. Its totient is φ = 1300105044.

The previous prime is 1516789529. The next prime is 1516789577. The reversal of 1516789561 is 1659876151.

It is a happy number.

It is not a de Polignac number, because 1516789561 - 2⁵ = 1516789529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1516789501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2210721 + ... + 2211406.

It is an arithmetic number, because the mean of its divisors is an integer number (221106400).

Almost surely, 2^1516789561 is an apocalyptic number.

It is an amenable number.

1516789561 is a deficient number, since it is larger than the sum of its proper divisors (252061639).

1516789561 is an frugal number, since it uses more digits than its factorization.

1516789561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422148 (or 4422134 counting only the distinct ones).

The product of its digits is 453600, while the sum is 49.

The square root of 1516789561 is about 38945.9826041146. The cubic root of 1516789561 is about 1148.9693503141.

The spelling of 1516789561 in words is "one billion, five hundred sixteen million, seven hundred eighty-nine thousand, five hundred sixty-one".