1563481867 has 4 divisors (see below), whose sum is σ = 1565093016. Its totient is φ = 1561870720.

The previous prime is 1563481813. The next prime is 1563481877. The reversal of 1563481867 is 7681843651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7681843651 = 71 ⋅108194981.

It is a cyclic number.

It is not a de Polignac number, because 1563481867 - 2²³ = 1555093259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1563481867.

It is not an unprimeable number, because it can be changed into a prime (1563481877) 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, 804118 + ... + 806059.

It is an arithmetic number, because the mean of its divisors is an integer number (391273254).

Almost surely, 2^1563481867 is an apocalyptic number.

1563481867 is a deficient number, since it is larger than the sum of its proper divisors (1611149).

1563481867 is an equidigital number, since it uses as much as digits as its factorization.

1563481867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611148.

The product of its digits is 967680, while the sum is 49.

The square root of 1563481867 is about 39540.8885459090. Note that the first 3 decimals coincide. The cubic root of 1563481867 is about 1160.6402200627.

The spelling of 1563481867 in words is "one billion, five hundred sixty-three million, four hundred eighty-one thousand, eight hundred sixty-seven".