1387516505 has 4 divisors (see below), whose sum is σ = 1665019812. Its totient is φ = 1110013200.

The previous prime is 1387516483. The next prime is 1387516567. The reversal of 1387516505 is 5056157831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271689289 + 1115827216 = 16483^2 + 33404^2 .

It is not a de Polignac number, because 1387516505 - 2¹⁶ = 1387450969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138751646 + ... + 138751655.

It is an arithmetic number, because the mean of its divisors is an integer number (416254953).

Almost surely, 2^1387516505 is an apocalyptic number.

It is an amenable number.

1387516505 is a deficient number, since it is larger than the sum of its proper divisors (277503307).

1387516505 is an equidigital number, since it uses as much as digits as its factorization.

1387516505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277503306.

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 1387516505 is about 37249.3826123333. The cubic root of 1387516505 is about 1115.3539747655.

The spelling of 1387516505 in words is "one billion, three hundred eighty-seven million, five hundred sixteen thousand, five hundred five".