31111054504121 has 2 divisors, whose sum is σ = 31111054504122. Its totient is φ = 31111054504120.

The previous prime is 31111054504099. The next prime is 31111054504141. The reversal of 31111054504121 is 12140545011113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31081305153721 + 29749350400 = 5575061^2 + 172480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31111054504121 is a prime.

It is a super-2 number, since 2×31111054504121² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31111054504141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555527252060 + 15555527252061.

It is an arithmetic number, because the mean of its divisors is an integer number (15555527252061).

Almost surely, 2^{31111054504121} is an apocalyptic number.

It is an amenable number.

31111054504121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111054504121 is an equidigital number, since it uses as much as digits as its factorization.

31111054504121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 31111054504121 its reverse (12140545011113), we get a palindrome (43251599515234).

The spelling of 31111054504121 in words is "thirty-one trillion, one hundred eleven billion, fifty-four million, five hundred four thousand, one hundred twenty-one".