1138261065 has 16 divisors (see below), whose sum is σ = 1865638656. Its totient is φ = 592265600.

The previous prime is 1138261051. The next prime is 1138261067. The reversal of 1138261065 is 5601628311.

It is not a de Polignac number, because 1138261065 - 2⁶ = 1138261001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138261067) 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, 924801 + ... + 926030.

It is an arithmetic number, because the mean of its divisors is an integer number (116602416).

Almost surely, 2^1138261065 is an apocalyptic number.

1138261065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1138261065 is a deficient number, since it is larger than the sum of its proper divisors (727377591).

1138261065 is a wasteful number, since it uses less digits than its factorization.

1138261065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850880.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1138261065 is about 33738.1247996980. The cubic root of 1138261065 is about 1044.1124963184.

Adding to 1138261065 its reverse (5601628311), we get a palindrome (6739889376).

The spelling of 1138261065 in words is "one billion, one hundred thirty-eight million, two hundred sixty-one thousand, sixty-five".