1318115381 has 16 divisors (see below), whose sum is σ = 1487808000. Its totient is φ = 1156915200.

The previous prime is 1318115369. The next prime is 1318115413. The reversal of 1318115381 is 1835118131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1318115381 - 2¹⁸ = 1317853237 is a prime.

It is a super-3 number, since 3×1318115381³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318115341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148805 + ... + 157413.

It is an arithmetic number, because the mean of its divisors is an integer number (92988000).

Almost surely, 2^1318115381 is an apocalyptic number.

1318115381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1318115381 is a deficient number, since it is larger than the sum of its proper divisors (169692619).

1318115381 is a wasteful number, since it uses less digits than its factorization.

1318115381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9100.

The product of its digits is 2880, while the sum is 32.

The square root of 1318115381 is about 36305.8587696256. The cubic root of 1318115381 is about 1096.4390027108.

The spelling of 1318115381 in words is "one billion, three hundred eighteen million, one hundred fifteen thousand, three hundred eighty-one".