20031101261 has 2 divisors, whose sum is σ = 20031101262. Its totient is φ = 20031101260.

The previous prime is 20031101191. The next prime is 20031101297. The reversal of 20031101261 is 16210113002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14498568100 + 5532533161 = 120410^2 + 74381^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031101261 - 2¹⁰ = 20031100237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031101161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015550630 + 10015550631.

It is an arithmetic number, because the mean of its divisors is an integer number (10015550631).

Almost surely, 2^20031101261 is an apocalyptic number.

It is an amenable number.

20031101261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031101261 is an equidigital number, since it uses as much as digits as its factorization.

20031101261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20031101261 its reverse (16210113002), we get a palindrome (36241214263).

The spelling of 20031101261 in words is "twenty billion, thirty-one million, one hundred one thousand, two hundred sixty-one".