1381517379 has 72 divisors (see below), whose sum is σ = 2410087680. Its totient is φ = 758466720.

The previous prime is 1381517369. The next prime is 1381517381. The reversal of 1381517379 is 9737151831.

It is a de Polignac number, because none of the positive numbers 2^k-1381517379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381517329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 474442 + ... + 477344.

It is an arithmetic number, because the mean of its divisors is an integer number (33473440).

Almost surely, 2^1381517379 is an apocalyptic number.

1381517379 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1381517379 is a deficient number, since it is larger than the sum of its proper divisors (1028570301).

1381517379 is a wasteful number, since it uses less digits than its factorization.

1381517379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973 (or 2959 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 1381517379 is about 37168.7688658099. The cubic root of 1381517379 is about 1113.7441883556.

It can be divided in two parts, 138151 and 7379, that added together give a triangular number (145530 = T₅₃₉).

The spelling of 1381517379 in words is "one billion, three hundred eighty-one million, five hundred seventeen thousand, three hundred seventy-nine".