1381915081 has 8 divisors (see below), whose sum is σ = 1397039904. Its totient is φ = 1366841280.

The previous prime is 1381915063. The next prime is 1381915097. The reversal of 1381915081 is 1805191831.

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

It is a cyclic number.

It is not a de Polignac number, because 1381915081 - 2¹¹ = 1381913033 is a prime.

It is a super-2 number, since 2×1381915081² = 3819378582190473122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1381915081.

It is not an unprimeable number, because it can be changed into a prime (1381915001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43030 + ... + 67936.

It is an arithmetic number, because the mean of its divisors is an integer number (174629988).

Almost surely, 2^1381915081 is an apocalyptic number.

It is an amenable number.

1381915081 is a deficient number, since it is larger than the sum of its proper divisors (15124823).

1381915081 is a wasteful number, since it uses less digits than its factorization.

1381915081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25511.

The product of its (nonzero) digits is 8640, while the sum is 37.

The square root of 1381915081 is about 37174.1184293589. The cubic root of 1381915081 is about 1113.8510505158.

It can be divided in two parts, 13819 and 15081, that added together give a square (28900 = 170²).

The spelling of 1381915081 in words is "one billion, three hundred eighty-one million, nine hundred fifteen thousand, eighty-one".