31120100320261 has 2 divisors, whose sum is σ = 31120100320262. Its totient is φ = 31120100320260.

The previous prime is 31120100320163. The next prime is 31120100320289. The reversal of 31120100320261 is 16202300102113.

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., 24724861208100 + 6395239112161 = 4972410^2 + 2528881^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120100320261 - 2¹¹ = 31120100318213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31120100323261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560050160130 + 15560050160131.

It is an arithmetic number, because the mean of its divisors is an integer number (15560050160131).

Almost surely, 2^{31120100320261} is an apocalyptic number.

It is an amenable number.

31120100320261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120100320261 is an equidigital number, since it uses as much as digits as its factorization.

31120100320261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31120100320261 its reverse (16202300102113), we get a palindrome (47322400422374).

The spelling of 31120100320261 in words is "thirty-one trillion, one hundred twenty billion, one hundred million, three hundred twenty thousand, two hundred sixty-one".