1538641513 has 6 divisors (see below), whose sum is σ = 1560058602. Its totient is φ = 1517233680.

The previous prime is 1538641499. The next prime is 1538641537. The reversal of 1538641513 is 3151468351.

It can be written as a sum of positive squares in only one way, i.e., 1348945984 + 189695529 = 36728^2 + 13773^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1538641513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1538641543) 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 in 5 ways as a sum of consecutive naturals, for example, 332848 + ... + 337438.

It is an arithmetic number, because the mean of its divisors is an integer number (260009767).

Almost surely, 2^1538641513 is an apocalyptic number.

It is an amenable number.

1538641513 is a deficient number, since it is larger than the sum of its proper divisors (21417089).

1538641513 is an frugal number, since it uses more digits than its factorization.

1538641513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9255 (or 4664 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 1538641513 is about 39225.5211947528. The cubic root of 1538641513 is about 1154.4606873518.

The spelling of 1538641513 in words is "one billion, five hundred thirty-eight million, six hundred forty-one thousand, five hundred thirteen".