1381081158 has 32 divisors (see below), whose sum is σ = 3230601600. Its totient is φ = 436130568.

The previous prime is 1381081157. The next prime is 1381081159. The reversal of 1381081158 is 8511801831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1381081157) and next prime (1381081159).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381081151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 672016 + ... + 674067.

It is an arithmetic number, because the mean of its divisors is an integer number (100956300).

Almost surely, 2^1381081158 is an apocalyptic number.

1381081158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1381081158 is an abundant number, since it is smaller than the sum of its proper divisors (1849520442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381081158 is a wasteful number, since it uses less digits than its factorization.

1381081158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346113 (or 1346107 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 36.

The square root of 1381081158 is about 37162.9002904779. The cubic root of 1381081158 is about 1113.6269525888.

Adding to 1381081158 its reverse (8511801831), we get a palindrome (9892882989).

The spelling of 1381081158 in words is "one billion, three hundred eighty-one million, eighty-one thousand, one hundred fifty-eight".