31003122331213 has 2 divisors, whose sum is σ = 31003122331214. Its totient is φ = 31003122331212.

The previous prime is 31003122331187. The next prime is 31003122331271. The reversal of 31003122331213 is 31213322130013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16314506530884 + 14688615800329 = 4039122^2 + 3832573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31003122331213 is a prime.

It is a super-2 number, since 2×31003122331213² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31003122331613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15501561165606 + 15501561165607.

It is an arithmetic number, because the mean of its divisors is an integer number (15501561165607).

Almost surely, 2^{31003122331213} is an apocalyptic number.

It is an amenable number.

31003122331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31003122331213 is an equidigital number, since it uses as much as digits as its factorization.

31003122331213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31003122331213 its reverse (31213322130013), we get a palindrome (62216444461226).

The spelling of 31003122331213 in words is "thirty-one trillion, three billion, one hundred twenty-two million, three hundred thirty-one thousand, two hundred thirteen".