11503993 has 2 divisors, whose sum is σ = 11503994. Its totient is φ = 11503992.

The previous prime is 11503939. The next prime is 11504011. The reversal of 11503993 is 39930511.

Together with previous prime (11503939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10778089 + 725904 = 3283^2 + 852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11503993 is a prime.

It is not a weakly prime, because it can be changed into another prime (11506993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5751996 + 5751997.

It is an arithmetic number, because the mean of its divisors is an integer number (5751997).

Almost surely, 2^11503993 is an apocalyptic number.

It is an amenable number.

11503993 is a deficient number, since it is larger than the sum of its proper divisors (1).

11503993 is an equidigital number, since it uses as much as digits as its factorization.

11503993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645, while the sum is 31.

The square root of 11503993 is about 3391.7536761976. The cubic root of 11503993 is about 225.7439931409.

The spelling of 11503993 in words is "eleven million, five hundred three thousand, nine hundred ninety-three".