20131154243 has 2 divisors, whose sum is σ = 20131154244. Its totient is φ = 20131154242.

The previous prime is 20131154203. The next prime is 20131154291. The reversal of 20131154243 is 34245113102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20131154243 - 2¹⁶ = 20131088707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20131154203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065577121 + 10065577122.

It is an arithmetic number, because the mean of its divisors is an integer number (10065577122).

Almost surely, 2^20131154243 is an apocalyptic number.

20131154243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131154243 is an equidigital number, since it uses as much as digits as its factorization.

20131154243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20131154243 its reverse (34245113102), we get a palindrome (54376267345).

The spelling of 20131154243 in words is "twenty billion, one hundred thirty-one million, one hundred fifty-four thousand, two hundred forty-three".