1663544131 has 4 divisors (see below), whose sum is σ = 1667106792. Its totient is φ = 1659981472.

The previous prime is 1663544111. The next prime is 1663544147. The reversal of 1663544131 is 1314453661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1314453661 = 31 ⋅42401731.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663544131 is a prime.

It is a super-2 number, since 2×1663544131² = 5534758151569090322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663544111) 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, 1780630 + ... + 1781563.

It is an arithmetic number, because the mean of its divisors is an integer number (416776698).

Almost surely, 2^1663544131 is an apocalyptic number.

1663544131 is a deficient number, since it is larger than the sum of its proper divisors (3562661).

1663544131 is an equidigital number, since it uses as much as digits as its factorization.

1663544131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3562660.

The product of its digits is 25920, while the sum is 34.

The square root of 1663544131 is about 40786.5680218378. The cubic root of 1663544131 is about 1184.8902035274.

Adding to 1663544131 its reverse (1314453661), we get a palindrome (2977997792).

The spelling of 1663544131 in words is "one billion, six hundred sixty-three million, five hundred forty-four thousand, one hundred thirty-one".