31212103183837 has 2 divisors, whose sum is σ = 31212103183838. Its totient is φ = 31212103183836.

The previous prime is 31212103183769. The next prime is 31212103183847. The reversal of 31212103183837 is 73838130121213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29385007590436 + 1827095593401 = 5420794^2 + 1351701^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212103183837 - 2¹⁵ = 31212103151069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31212103183793 and 31212103183802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212103183847) 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, 15606051591918 + 15606051591919.

It is an arithmetic number, because the mean of its divisors is an integer number (15606051591919).

Almost surely, 2^{31212103183837} is an apocalyptic number.

It is an amenable number.

31212103183837 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212103183837 is an equidigital number, since it uses as much as digits as its factorization.

31212103183837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 31212103183837 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred eighty-three thousand, eight hundred thirty-seven".