31525343513 has 2 divisors, whose sum is σ = 31525343514. Its totient is φ = 31525343512.

The previous prime is 31525343467. The next prime is 31525343561. The reversal of 31525343513 is 31534352513.

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., 27128725264 + 4396618249 = 164708^2 + 66307^2 .

It is an emirp because it is prime and its reverse (31534352513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31525343513 - 2²⁸ = 31256908057 is a prime.

It is a super-2 number, since 2×31525343513² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31525340513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15762671756 + 15762671757.

It is an arithmetic number, because the mean of its divisors is an integer number (15762671757).

Almost surely, 2^31525343513 is an apocalyptic number.

It is an amenable number.

31525343513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31525343513 is an equidigital number, since it uses as much as digits as its factorization.

31525343513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 35.

The spelling of 31525343513 in words is "thirty-one billion, five hundred twenty-five million, three hundred forty-three thousand, five hundred thirteen".