1138121799 has 4 divisors (see below), whose sum is σ = 1517495736. Its totient is φ = 758747864.

The previous prime is 1138121783. The next prime is 1138121821. The reversal of 1138121799 is 9971218311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9971218311 = 3 ⋅3323739437.

It is a cyclic number.

It is not a de Polignac number, because 1138121799 - 2⁴ = 1138121783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1138121799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138121399) 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, 189686964 + ... + 189686969.

It is an arithmetic number, because the mean of its divisors is an integer number (379373934).

Almost surely, 2^1138121799 is an apocalyptic number.

1138121799 is a deficient number, since it is larger than the sum of its proper divisors (379373937).

1138121799 is an equidigital number, since it uses as much as digits as its factorization.

1138121799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379373936.

The product of its digits is 27216, while the sum is 42.

The square root of 1138121799 is about 33736.0608103554. The cubic root of 1138121799 is about 1044.0699122674.

The spelling of 1138121799 in words is "one billion, one hundred thirty-eight million, one hundred twenty-one thousand, seven hundred ninety-nine".