1138792517 has 4 divisors (see below), whose sum is σ = 1139500140. Its totient is φ = 1138084896.

The previous prime is 1138792483. The next prime is 1138792541. The reversal of 1138792517 is 7152978311.

It is a Cunningham number, because it is equal to 33746²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 711502276 + 427290241 = 26674^2 + 20671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138792517 - 2²⁰ = 1137743941 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 (1138792117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351392 + ... + 354617.

It is an arithmetic number, because the mean of its divisors is an integer number (284875035).

Almost surely, 2^1138792517 is an apocalyptic number.

It is an amenable number.

1138792517 is a deficient number, since it is larger than the sum of its proper divisors (707623).

1138792517 is an equidigital number, since it uses as much as digits as its factorization.

1138792517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707622.

The product of its digits is 105840, while the sum is 44.

The square root of 1138792517 is about 33746.0000148166. Note that the first 4 decimals coincide. The cubic root of 1138792517 is about 1044.2749691037.

The spelling of 1138792517 in words is "one billion, one hundred thirty-eight million, seven hundred ninety-two thousand, five hundred seventeen".