1385919081 has 12 divisors (see below), whose sum is σ = 2002539760. Its totient is φ = 923643000.

The previous prime is 1385919061. The next prime is 1385919083. The reversal of 1385919081 is 1809195831.

1385919081 is a `hidden beast` number, since 1 + 385 + 9 + 190 + 81 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1385919081 is a prime.

It is a super-2 number, since 2×1385919081² = 3841543398159769122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1385919083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5706 + ... + 52956.

Almost surely, 2^1385919081 is an apocalyptic number.

It is an amenable number.

1385919081 is a deficient number, since it is larger than the sum of its proper divisors (616620679).

1385919081 is a wasteful number, since it uses less digits than its factorization.

1385919081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50516 (or 50513 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 45.

The square root of 1385919081 is about 37227.9341489694. The cubic root of 1385919081 is about 1114.9257810867.

The spelling of 1385919081 in words is "one billion, three hundred eighty-five million, nine hundred nineteen thousand, eighty-one".