31345551121 has 2 divisors, whose sum is σ = 31345551122. Its totient is φ = 31345551120.

The previous prime is 31345551113. The next prime is 31345551151. The reversal of 31345551121 is 12115554313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17046174721 + 14299376400 = 130561^2 + 119580^2 .

It is a cyclic number.

It is not a de Polignac number, because 31345551121 - 2³ = 31345551113 is a prime.

It is not a weakly prime, because it can be changed into another prime (31345551151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15672775560 + 15672775561.

It is an arithmetic number, because the mean of its divisors is an integer number (15672775561).

Almost surely, 2^31345551121 is an apocalyptic number.

It is an amenable number.

31345551121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31345551121 is an equidigital number, since it uses as much as digits as its factorization.

31345551121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The spelling of 31345551121 in words is "thirty-one billion, three hundred forty-five million, five hundred fifty-one thousand, one hundred twenty-one".