1381985089 has 4 divisors (see below), whose sum is σ = 1384076500. Its totient is φ = 1379893680.

The previous prime is 1381985071. The next prime is 1381985117. The reversal of 1381985089 is 9805891831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 771895089 + 610090000 = 27783^2 + 24700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381985089 - 2⁹ = 1381984577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381985389) 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, 1044714 + ... + 1046035.

It is an arithmetic number, because the mean of its divisors is an integer number (346019125).

Almost surely, 2^1381985089 is an apocalyptic number.

It is an amenable number.

1381985089 is a deficient number, since it is larger than the sum of its proper divisors (2091411).

1381985089 is an equidigital number, since it uses as much as digits as its factorization.

1381985089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091410.

The product of its (nonzero) digits is 622080, while the sum is 52.

The square root of 1381985089 is about 37175.0600403012. The cubic root of 1381985089 is about 1113.8698594785.

The spelling of 1381985089 in words is "one billion, three hundred eighty-one million, nine hundred eighty-five thousand, eighty-nine".