1381563689 has 4 divisors (see below), whose sum is σ = 1507160400. Its totient is φ = 1255966980.

The previous prime is 1381563679. The next prime is 1381563709. The reversal of 1381563689 is 9863651831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1381563689 - 2⁸ = 1381563433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381563649) 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, 62798339 + ... + 62798360.

It is an arithmetic number, because the mean of its divisors is an integer number (376790100).

Almost surely, 2^1381563689 is an apocalyptic number.

It is an amenable number.

1381563689 is a deficient number, since it is larger than the sum of its proper divisors (125596711).

1381563689 is a wasteful number, since it uses less digits than its factorization.

1381563689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125596710.

The product of its digits is 933120, while the sum is 50.

The square root of 1381563689 is about 37169.3918298376. The cubic root of 1381563689 is about 1113.7566328648.

The spelling of 1381563689 in words is "one billion, three hundred eighty-one million, five hundred sixty-three thousand, six hundred eighty-nine".