31225457213 has 2 divisors, whose sum is σ = 31225457214. Its totient is φ = 31225457212.

The previous prime is 31225457167. The next prime is 31225457227. The reversal of 31225457213 is 31275452213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15760793764 + 15464663449 = 125542^2 + 124357^2 .

It is a cyclic number.

It is not a de Polignac number, because 31225457213 - 2¹⁸ = 31225195069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31225457233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612728606 + 15612728607.

It is an arithmetic number, because the mean of its divisors is an integer number (15612728607).

Almost surely, 2^31225457213 is an apocalyptic number.

It is an amenable number.

31225457213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225457213 is an equidigital number, since it uses as much as digits as its factorization.

31225457213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 35.

Subtracting 31225457213 from its reverse (31275452213), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 31225457213 in words is "thirty-one billion, two hundred twenty-five million, four hundred fifty-seven thousand, two hundred thirteen".