1538690513 has 2 divisors, whose sum is σ = 1538690514. Its totient is φ = 1538690512.

The previous prime is 1538690479. The next prime is 1538690521. The reversal of 1538690513 is 3150968351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537267264 + 1423249 = 39208^2 + 1193^2 .

It is an emirp because it is prime and its reverse (3150968351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1538690513 - 2⁶ = 1538690449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1538600513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769345256 + 769345257.

It is an arithmetic number, because the mean of its divisors is an integer number (769345257).

Almost surely, 2^1538690513 is an apocalyptic number.

It is an amenable number.

1538690513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538690513 is an equidigital number, since it uses as much as digits as its factorization.

1538690513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 1538690513 is about 39226.1457831381. The cubic root of 1538690513 is about 1154.4729423124.

The spelling of 1538690513 in words is "one billion, five hundred thirty-eight million, six hundred ninety thousand, five hundred thirteen".