20203131031261 has 2 divisors, whose sum is σ = 20203131031262. Its totient is φ = 20203131031260.

The previous prime is 20203131031243. The next prime is 20203131031267. The reversal of 20203131031261 is 16213013130202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18351542176900 + 1851588854361 = 4283870^2 + 1360731^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203131031261 - 2²³ = 20203122642653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20203131031267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101565515630 + 10101565515631.

It is an arithmetic number, because the mean of its divisors is an integer number (10101565515631).

Almost surely, 2^{20203131031261} is an apocalyptic number.

It is an amenable number.

20203131031261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203131031261 is an equidigital number, since it uses as much as digits as its factorization.

20203131031261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 20203131031261 its reverse (16213013130202), we get a palindrome (36416144161463).

The spelling of 20203131031261 in words is "twenty trillion, two hundred three billion, one hundred thirty-one million, thirty-one thousand, two hundred sixty-one".