1381518647 has 4 divisors (see below), whose sum is σ = 1394193240. Its totient is φ = 1368844056.

The previous prime is 1381518643. The next prime is 1381518653. The reversal of 1381518647 is 7468151831.

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 1381518647 - 2² = 1381518643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1381518598 and 1381518607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381518643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6337133 + ... + 6337350.

It is an arithmetic number, because the mean of its divisors is an integer number (348548310).

Almost surely, 2^1381518647 is an apocalyptic number.

1381518647 is a deficient number, since it is larger than the sum of its proper divisors (12674593).

1381518647 is a wasteful number, since it uses less digits than its factorization.

1381518647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12674592.

The product of its digits is 161280, while the sum is 44.

The square root of 1381518647 is about 37168.7859231372. The cubic root of 1381518647 is about 1113.7445290986.

The spelling of 1381518647 in words is "one billion, three hundred eighty-one million, five hundred eighteen thousand, six hundred forty-seven".