1231563559 has 4 divisors (see below), whose sum is σ = 1260204616. Its totient is φ = 1202922504.

The previous prime is 1231563547. The next prime is 1231563569. The reversal of 1231563559 is 9553651321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9553651321 = 8443 ⋅1131547.

It is a cyclic number.

It is not a de Polignac number, because 1231563559 - 2¹¹ = 1231561511 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 (1231563539) 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, 14320464 + ... + 14320549.

It is an arithmetic number, because the mean of its divisors is an integer number (315051154).

Almost surely, 2^1231563559 is an apocalyptic number.

1231563559 is a deficient number, since it is larger than the sum of its proper divisors (28641057).

1231563559 is an equidigital number, since it uses as much as digits as its factorization.

1231563559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28641056.

The product of its digits is 121500, while the sum is 40.

The square root of 1231563559 is about 35093.6398653659. The cubic root of 1231563559 is about 1071.8950778980.

The spelling of 1231563559 in words is "one billion, two hundred thirty-one million, five hundred sixty-three thousand, five hundred fifty-nine".