1381715515 has 4 divisors (see below), whose sum is σ = 1658058624. Its totient is φ = 1105372408.

The previous prime is 1381715509. The next prime is 1381715537. The reversal of 1381715515 is 5155171831.

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

It is a cyclic number.

It is not a de Polignac number, because 1381715515 - 2¹¹ = 1381713467 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 138171547 + ... + 138171556.

It is an arithmetic number, because the mean of its divisors is an integer number (414514656).

Almost surely, 2^1381715515 is an apocalyptic number.

1381715515 is a deficient number, since it is larger than the sum of its proper divisors (276343109).

1381715515 is an equidigital number, since it uses as much as digits as its factorization.

1381715515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276343108.

The product of its digits is 21000, while the sum is 37.

The square root of 1381715515 is about 37171.4341262212. The cubic root of 1381715515 is about 1113.7974298790.

The spelling of 1381715515 in words is "one billion, three hundred eighty-one million, seven hundred fifteen thousand, five hundred fifteen".