11511001 has 2 divisors, whose sum is σ = 11511002. Its totient is φ = 11511000.

The previous prime is 11510987. The next prime is 11511029. The reversal of 11511001 is 10011511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 488601 = 3320^2 + 699^2 .

It is an emirp because it is prime and its reverse (10011511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11511001 - 2⁵ = 11510969 is a prime.

It is not a weakly prime, because it can be changed into another prime (11511041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755500 + 5755501.

It is an arithmetic number, because the mean of its divisors is an integer number (5755501).

Almost surely, 2^11511001 is an apocalyptic number.

It is an amenable number.

11511001 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511001 is an equidigital number, since it uses as much as digits as its factorization.

11511001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5, while the sum is 10.

The square root of 11511001 is about 3392.7866128008. The cubic root of 11511001 is about 225.7898233950.

Adding to 11511001 its reverse (10011511), we get a palindrome (21522512).

The spelling of 11511001 in words is "eleven million, five hundred eleven thousand, one".