1381961585 has 8 divisors (see below), whose sum is σ = 1659215616. Its totient is φ = 1104994800.

The previous prime is 1381961557. The next prime is 1381961597. The reversal of 1381961585 is 5851691831.

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

It is not a de Polignac number, because 1381961585 - 2⁶ = 1381961521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61079 + ... + 80588.

It is an arithmetic number, because the mean of its divisors is an integer number (207401952).

Almost surely, 2^1381961585 is an apocalyptic number.

It is an amenable number.

1381961585 is a deficient number, since it is larger than the sum of its proper divisors (277254031).

1381961585 is a wasteful number, since it uses less digits than its factorization.

1381961585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143623.

The product of its digits is 259200, while the sum is 47.

The square root of 1381961585 is about 37174.7439130386. The cubic root of 1381961585 is about 1113.8635447588.

The spelling of 1381961585 in words is "one billion, three hundred eighty-one million, nine hundred sixty-one thousand, five hundred eighty-five".