31111002320261 has 2 divisors, whose sum is σ = 31111002320262. Its totient is φ = 31111002320260.

The previous prime is 31111002320107. The next prime is 31111002320267. The reversal of 31111002320261 is 16202320011113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29351267417761 + 1759734902500 = 5417681^2 + 1326550^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111002320261 - 2²⁶ = 31110935211397 is a prime.

It is a super-2 number, since 2×31111002320261² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31111002320267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555501160130 + 15555501160131.

It is an arithmetic number, because the mean of its divisors is an integer number (15555501160131).

Almost surely, 2^{31111002320261} is an apocalyptic number.

It is an amenable number.

31111002320261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111002320261 is an equidigital number, since it uses as much as digits as its factorization.

31111002320261 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 23.

Adding to 31111002320261 its reverse (16202320011113), we get a palindrome (47313322331374).

The spelling of 31111002320261 in words is "thirty-one trillion, one hundred eleven billion, two million, three hundred twenty thousand, two hundred sixty-one".