1516463561 has 4 divisors (see below), whose sum is σ = 1516654212. Its totient is φ = 1516272912.

The previous prime is 1516463551. The next prime is 1516463569. The reversal of 1516463561 is 1653646151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1508934025 + 7529536 = 38845^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516463561 - 2¹⁰ = 1516462537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1516463569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82850 + ... + 99483.

It is an arithmetic number, because the mean of its divisors is an integer number (379163553).

Almost surely, 2^1516463561 is an apocalyptic number.

It is an amenable number.

1516463561 is a deficient number, since it is larger than the sum of its proper divisors (190651).

1516463561 is an equidigital number, since it uses as much as digits as its factorization.

1516463561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190650.

The product of its digits is 64800, while the sum is 38.

The square root of 1516463561 is about 38941.7970951521. The cubic root of 1516463561 is about 1148.8870293260.

The spelling of 1516463561 in words is "one billion, five hundred sixteen million, four hundred sixty-three thousand, five hundred sixty-one".