31520452213309 has 2 divisors, whose sum is σ = 31520452213310. Its totient is φ = 31520452213308.

The previous prime is 31520452213267. The next prime is 31520452213361. The reversal of 31520452213309 is 90331225402513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25514399187684 + 6006053025625 = 5051178^2 + 2450725^2 .

It is an emirp because it is prime and its reverse (90331225402513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31520452213309 - 2⁴¹ = 29321428957757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31520452210309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760226106654 + 15760226106655.

It is an arithmetic number, because the mean of its divisors is an integer number (15760226106655).

Almost surely, 2^{31520452213309} is an apocalyptic number.

It is an amenable number.

31520452213309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31520452213309 is an equidigital number, since it uses as much as digits as its factorization.

31520452213309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 31520452213309 in words is "thirty-one trillion, five hundred twenty billion, four hundred fifty-two million, two hundred thirteen thousand, three hundred nine".