31000330121 has 2 divisors, whose sum is σ = 31000330122. Its totient is φ = 31000330120.

The previous prime is 31000330079. The next prime is 31000330159. The reversal of 31000330121 is 12103300013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30953476096 + 46854025 = 175936^2 + 6845^2 .

It is a cyclic number.

It is not a de Polignac number, because 31000330121 - 2¹⁴ = 31000313737 is a prime.

It is a super-2 number, since 2×31000330121² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000330096 and 31000330105.

It is not a weakly prime, because it can be changed into another prime (31000330421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500165060 + 15500165061.

It is an arithmetic number, because the mean of its divisors is an integer number (15500165061).

Almost surely, 2^31000330121 is an apocalyptic number.

It is an amenable number.

31000330121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000330121 is an equidigital number, since it uses as much as digits as its factorization.

31000330121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31000330121 its reverse (12103300013), we get a palindrome (43103630134).

The spelling of 31000330121 in words is "thirty-one billion, three hundred thirty thousand, one hundred twenty-one".