31203223193 has 2 divisors, whose sum is σ = 31203223194. Its totient is φ = 31203223192.

The previous prime is 31203223187. The next prime is 31203223213. The reversal of 31203223193 is 39132230213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18809299609 + 12393923584 = 137147^2 + 111328^2 .

It is an emirp because it is prime and its reverse (39132230213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31203223193 - 2¹⁴ = 31203206809 is a prime.

It is a super-2 number, since 2×31203223193² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31203223153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15601611596 + 15601611597.

It is an arithmetic number, because the mean of its divisors is an integer number (15601611597).

Almost surely, 2^31203223193 is an apocalyptic number.

It is an amenable number.

31203223193 is a deficient number, since it is larger than the sum of its proper divisors (1).

31203223193 is an equidigital number, since it uses as much as digits as its factorization.

31203223193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 29.

The spelling of 31203223193 in words is "thirty-one billion, two hundred three million, two hundred twenty-three thousand, one hundred ninety-three".