31323003121 has 2 divisors, whose sum is σ = 31323003122. Its totient is φ = 31323003120.

The previous prime is 31323003113. The next prime is 31323003139. The reversal of 31323003121 is 12130032313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24385945600 + 6937057521 = 156160^2 + 83289^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323003121 - 2³ = 31323003113 is a prime.

It is a super-2 number, since 2×31323003121² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31323003191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661501560 + 15661501561.

It is an arithmetic number, because the mean of its divisors is an integer number (15661501561).

Almost surely, 2^31323003121 is an apocalyptic number.

It is an amenable number.

31323003121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323003121 is an equidigital number, since it uses as much as digits as its factorization.

31323003121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31323003121 its reverse (12130032313), we get a palindrome (43453035434).

The spelling of 31323003121 in words is "thirty-one billion, three hundred twenty-three million, three thousand, one hundred twenty-one".