11381603 has 4 divisors (see below), whose sum is σ = 11492208. Its totient is φ = 11271000.

The previous prime is 11381597. The next prime is 11381621. The reversal of 11381603 is 30618311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30618311 = 1721 ⋅17791.

It is a cyclic number.

It is not a de Polignac number, because 11381603 - 2¹² = 11377507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11381633) 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, 55148 + ... + 55353.

It is an arithmetic number, because the mean of its divisors is an integer number (2873052).

Almost surely, 2^11381603 is an apocalyptic number.

11381603 is a deficient number, since it is larger than the sum of its proper divisors (110605).

11381603 is a wasteful number, since it uses less digits than its factorization.

11381603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110604.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 11381603 is about 3373.6631426389. The cubic root of 11381603 is about 224.9405801941.

Adding to 11381603 its reverse (30618311), we get a palindrome (41999914).

The spelling of 11381603 in words is "eleven million, three hundred eighty-one thousand, six hundred three".