31240343011121 has 2 divisors, whose sum is σ = 31240343011122. Its totient is φ = 31240343011120.

The previous prime is 31240343011079. The next prime is 31240343011151. The reversal of 31240343011121 is 12111034304213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25856574124096 + 5383768887025 = 5084936^2 + 2320295^2 .

It is a cyclic number.

It is not a de Polignac number, because 31240343011121 - 2²⁶ = 31240275902257 is a prime.

It is not a weakly prime, because it can be changed into another prime (31240343011151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620171505560 + 15620171505561.

It is an arithmetic number, because the mean of its divisors is an integer number (15620171505561).

Almost surely, 2^{31240343011121} is an apocalyptic number.

It is an amenable number.

31240343011121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240343011121 is an equidigital number, since it uses as much as digits as its factorization.

31240343011121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 31240343011121 its reverse (12111034304213), we get a palindrome (43351377315334).

The spelling of 31240343011121 in words is "thirty-one trillion, two hundred forty billion, three hundred forty-three million, eleven thousand, one hundred twenty-one".