39689819513 has 2 divisors, whose sum is σ = 39689819514. Its totient is φ = 39689819512.

The previous prime is 39689819503. The next prime is 39689819531. The reversal of 39689819513 is 31591898693.

Together with next prime (39689819531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36674931049 + 3014888464 = 191507^2 + 54908^2 .

It is a cyclic number.

It is not a de Polignac number, because 39689819513 - 2²² = 39685625209 is a prime.

It is not a weakly prime, because it can be changed into another prime (39689819503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19844909756 + 19844909757.

It is an arithmetic number, because the mean of its divisors is an integer number (19844909757).

Almost surely, 2^39689819513 is an apocalyptic number.

It is an amenable number.

39689819513 is a deficient number, since it is larger than the sum of its proper divisors (1).

39689819513 is an equidigital number, since it uses as much as digits as its factorization.

39689819513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 62.

The spelling of 39689819513 in words is "thirty-nine billion, six hundred eighty-nine million, eight hundred nineteen thousand, five hundred thirteen".