1381634665 has 8 divisors (see below), whose sum is σ = 1676590920. Its totient is φ = 1092888192.

The previous prime is 1381634641. The next prime is 1381634699. The reversal of 1381634665 is 5664361831.

It can be written as a sum of positive squares in 4 ways, for example, as 236759769 + 1144874896 = 15387^2 + 33836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1381634665 - 2¹³ = 1381626473 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551954 + ... + 1552843.

It is an arithmetic number, because the mean of its divisors is an integer number (209573865).

Almost surely, 2^1381634665 is an apocalyptic number.

It is an amenable number.

1381634665 is a deficient number, since it is larger than the sum of its proper divisors (294956255).

1381634665 is an equidigital number, since it uses as much as digits as its factorization.

1381634665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104891.

The product of its digits is 311040, while the sum is 43.

The square root of 1381634665 is about 37170.3465816503. The cubic root of 1381634665 is about 1113.7757051275.

The spelling of 1381634665 in words is "one billion, three hundred eighty-one million, six hundred thirty-four thousand, six hundred sixty-five".