20312652031261 has 2 divisors, whose sum is σ = 20312652031262. Its totient is φ = 20312652031260.

The previous prime is 20312652031223. The next prime is 20312652031267. The reversal of 20312652031261 is 16213025621302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18887768152036 + 1424883879225 = 4346006^2 + 1193685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312652031261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312652031267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156326015630 + 10156326015631.

It is an arithmetic number, because the mean of its divisors is an integer number (10156326015631).

Almost surely, 2^{20312652031261} is an apocalyptic number.

It is an amenable number.

20312652031261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312652031261 is an equidigital number, since it uses as much as digits as its factorization.

20312652031261 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20312652031261 its reverse (16213025621302), we get a palindrome (36525677652563).

The spelling of 20312652031261 in words is "twenty trillion, three hundred twelve billion, six hundred fifty-two million, thirty-one thousand, two hundred sixty-one".