1563641247 has 8 divisors (see below), whose sum is σ = 2382691456. Its totient is φ = 893509272.

The previous prime is 1563641237. The next prime is 1563641257. The reversal of 1563641247 is 7421463651.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1563641237) and next prime (1563641257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1563641247 - 2¹⁴ = 1563624863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563641237) 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, 37229533 + ... + 37229574.

It is an arithmetic number, because the mean of its divisors is an integer number (297836432).

Almost surely, 2^1563641247 is an apocalyptic number.

1563641247 is a deficient number, since it is larger than the sum of its proper divisors (819050209).

1563641247 is an equidigital number, since it uses as much as digits as its factorization.

1563641247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74459117.

The product of its digits is 120960, while the sum is 39.

The square root of 1563641247 is about 39542.9038766755. The cubic root of 1563641247 is about 1160.6796569454.

The spelling of 1563641247 in words is "one billion, five hundred sixty-three million, six hundred forty-one thousand, two hundred forty-seven".