20312103131 has 2 divisors, whose sum is σ = 20312103132. Its totient is φ = 20312103130.

The previous prime is 20312103127. The next prime is 20312103143. The reversal of 20312103131 is 13130121302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20312103131 - 2² = 20312103127 is a prime.

It is a super-2 number, since 2×20312103131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20312103101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156051565 + 10156051566.

It is an arithmetic number, because the mean of its divisors is an integer number (10156051566).

Almost surely, 2^20312103131 is an apocalyptic number.

20312103131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312103131 is an equidigital number, since it uses as much as digits as its factorization.

20312103131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20312103131 its reverse (13130121302), we get a palindrome (33442224433).

The spelling of 20312103131 in words is "twenty billion, three hundred twelve million, one hundred three thousand, one hundred thirty-one".