20313111251 has 2 divisors, whose sum is σ = 20313111252. Its totient is φ = 20313111250.

The previous prime is 20313111241. The next prime is 20313111253. The reversal of 20313111251 is 15211131302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20313111251 - 2⁶ = 20313111187 is a prime.

Together with 20313111253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20313111253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156555625 + 10156555626.

It is an arithmetic number, because the mean of its divisors is an integer number (10156555626).

Almost surely, 2^20313111251 is an apocalyptic number.

20313111251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313111251 is an equidigital number, since it uses as much as digits as its factorization.

20313111251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 20313111251 its reverse (15211131302), we get a palindrome (35524242553).

The spelling of 20313111251 in words is "twenty billion, three hundred thirteen million, one hundred eleven thousand, two hundred fifty-one".