1381633636 has 6 divisors (see below), whose sum is σ = 2417858870. Its totient is φ = 690816816.

The previous prime is 1381633579. The next prime is 1381633663. The reversal of 1381633636 is 6363361831.

It can be written as a sum of positive squares in only one way, i.e., 832668736 + 548964900 = 28856^2 + 23430^2 .

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 as a sum of consecutive naturals, namely, 172704201 + ... + 172704208.

Almost surely, 2^1381633636 is an apocalyptic number.

It is an amenable number.

1381633636 is a deficient number, since it is larger than the sum of its proper divisors (1036225234).

1381633636 is a wasteful number, since it uses less digits than its factorization.

1381633636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345408413 (or 345408411 counting only the distinct ones).

The product of its digits is 139968, while the sum is 40.

The square root of 1381633636 is about 37170.3327399688. The cubic root of 1381633636 is about 1113.7754286252.

The spelling of 1381633636 in words is "one billion, three hundred eighty-one million, six hundred thirty-three thousand, six hundred thirty-six".