1138251517 has 8 divisors (see below), whose sum is σ = 1237947480. Its totient is φ = 1040289600.

The previous prime is 1138251497. The next prime is 1138251523. The reversal of 1138251517 is 7151528311.

It can be written as a sum of positive squares in 4 ways, for example, as 438860601 + 699390916 = 20949^2 + 26446^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1138251517 - 2¹⁵ = 1138218749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138251817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432142 + ... + 434767.

It is an arithmetic number, because the mean of its divisors is an integer number (154743435).

Almost surely, 2^1138251517 is an apocalyptic number.

It is an amenable number.

1138251517 is a deficient number, since it is larger than the sum of its proper divisors (99695963).

1138251517 is a wasteful number, since it uses less digits than its factorization.

1138251517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867023.

The product of its digits is 8400, while the sum is 34.

The square root of 1138251517 is about 33737.9832977610. The cubic root of 1138251517 is about 1044.1095768903.

Adding to 1138251517 its reverse (7151528311), we get a palindrome (8289779828).

The spelling of 1138251517 in words is "one billion, one hundred thirty-eight million, two hundred fifty-one thousand, five hundred seventeen".