2531218243 has 2 divisors, whose sum is σ = 2531218244. Its totient is φ = 2531218242.

The previous prime is 2531218237. The next prime is 2531218297. The reversal of 2531218243 is 3428121352.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2531218243 is a prime.

It is not a weakly prime, because it can be changed into another prime (2531218343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265609121 + 1265609122.

It is an arithmetic number, because the mean of its divisors is an integer number (1265609122).

Almost surely, 2^2531218243 is an apocalyptic number.

2531218243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531218243 is an equidigital number, since it uses as much as digits as its factorization.

2531218243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 2531218243 is about 50311.2138891520. The cubic root of 2531218243 is about 1362.8347452127.

Adding to 2531218243 its reverse (3428121352), we get a palindrome (5959339595).

The spelling of 2531218243 in words is "two billion, five hundred thirty-one million, two hundred eighteen thousand, two hundred forty-three".