1138618361 has 8 divisors (see below), whose sum is σ = 1152779040. Its totient is φ = 1124543232.

The previous prime is 1138618343. The next prime is 1138618363. The reversal of 1138618361 is 1638168311.

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 1138618361 - 2⁶ = 1138618297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138618363) 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, 5606 + ... + 48048.

It is an arithmetic number, because the mean of its divisors is an integer number (144097380).

Almost surely, 2^1138618361 is an apocalyptic number.

It is an amenable number.

1138618361 is a deficient number, since it is larger than the sum of its proper divisors (14160679).

1138618361 is a wasteful number, since it uses less digits than its factorization.

1138618361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42775.

The product of its digits is 20736, while the sum is 38.

The square root of 1138618361 is about 33743.4195214415. The cubic root of 1138618361 is about 1044.2217325920.

The spelling of 1138618361 in words is "one billion, one hundred thirty-eight million, six hundred eighteen thousand, three hundred sixty-one".