11500001 has 2 divisors, whose sum is σ = 11500002. Its totient is φ = 11500000.

The previous prime is 11499991. The next prime is 11500003. The reversal of 11500001 is 10000511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 3519376 = 2825^2 + 1876^2 .

It is an emirp because it is prime and its reverse (10000511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11500001 - 2⁶ = 11499937 is a prime.

Together with 11500003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11500003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5750000 + 5750001.

It is an arithmetic number, because the mean of its divisors is an integer number (5750001).

Almost surely, 2^11500001 is an apocalyptic number.

It is an amenable number.

11500001 is a deficient number, since it is larger than the sum of its proper divisors (1).

11500001 is an equidigital number, since it uses as much as digits as its factorization.

11500001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5, while the sum is 8.

The square root of 11500001 is about 3391.1651390046. The cubic root of 11500001 is about 225.7178783162.

Adding to 11500001 its reverse (10000511), we get a palindrome (21500512).

The spelling of 11500001 in words is "eleven million, five hundred thousand, one".