31301320243121 has 2 divisors, whose sum is σ = 31301320243122. Its totient is φ = 31301320243120.

The previous prime is 31301320243117. The next prime is 31301320243129. The reversal of 31301320243121 is 12134202310313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16224904840225 + 15076415402896 = 4028015^2 + 3882836^2 .

It is a cyclic number.

It is not a de Polignac number, because 31301320243121 - 2² = 31301320243117 is a prime.

It is not a weakly prime, because it can be changed into another prime (31301320243129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650660121560 + 15650660121561.

It is an arithmetic number, because the mean of its divisors is an integer number (15650660121561).

Almost surely, 2^{31301320243121} is an apocalyptic number.

It is an amenable number.

31301320243121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31301320243121 is an equidigital number, since it uses as much as digits as its factorization.

31301320243121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31301320243121 its reverse (12134202310313), we get a palindrome (43435522553434).

The spelling of 31301320243121 in words is "thirty-one trillion, three hundred one billion, three hundred twenty million, two hundred forty-three thousand, one hundred twenty-one".