1115523138 has 64 divisors (see below), whose sum is σ = 2405272320. Its totient is φ = 343994112.

The previous prime is 1115523137. The next prime is 1115523139. The reversal of 1115523138 is 8313255111.

It is an interprime number because it is at equal distance from previous prime (1115523137) and next prime (1115523139).

It is not an unprimeable number, because it can be changed into a prime (1115523131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1005328 + ... + 1006436.

It is an arithmetic number, because the mean of its divisors is an integer number (37582380).

Almost surely, 2^1115523138 is an apocalyptic number.

1115523138 is an abundant number, since it is smaller than the sum of its proper divisors (1289749182).

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

1115523138 is a wasteful number, since it uses less digits than its factorization.

1115523138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its digits is 3600, while the sum is 30.

The square root of 1115523138 is about 33399.4481690941. The cubic root of 1115523138 is about 1037.1132774204.

Adding to 1115523138 its reverse (8313255111), we get a palindrome (9428778249).

The spelling of 1115523138 in words is "one billion, one hundred fifteen million, five hundred twenty-three thousand, one hundred thirty-eight".