1138111065 has 72 divisors (see below), whose sum is σ = 2441424960. Its totient is φ = 480235392.

The previous prime is 1138111033. The next prime is 1138111067. The reversal of 1138111065 is 5601118311.

It is a happy number.

It is not a de Polignac number, because 1138111065 - 2⁵ = 1138111033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138111067) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 42546 + ... + 63924.

It is an arithmetic number, because the mean of its divisors is an integer number (33908680).

Almost surely, 2^1138111065 is an apocalyptic number.

1138111065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1138111065 is an abundant number, since it is smaller than the sum of its proper divisors (1303313895).

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

1138111065 is a wasteful number, since it uses less digits than its factorization.

1138111065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21423 (or 21407 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 1138111065 is about 33735.9017220527. The cubic root of 1138111065 is about 1044.0666299352.

Adding to 1138111065 its reverse (5601118311), we get a palindrome (6739229376).

The spelling of 1138111065 in words is "one billion, one hundred thirty-eight million, one hundred eleven thousand, sixty-five".