201511 has 2 divisors, whose sum is σ = 201512. Its totient is φ = 201510.

The previous prime is 201499. The next prime is 201517. The reversal of 201511 is 115102.

It is a happy number.

201511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201511 - 2¹⁵ = 168743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100755 + 100756.

It is an arithmetic number, because the mean of its divisors is an integer number (100756).

2²⁰¹⁵¹¹ is an apocalyptic number.

201511 is a deficient number, since it is larger than the sum of its proper divisors (1).

201511 is an equidigital number, since it uses as much as digits as its factorization.

201511 is an odious number, because the sum of its binary digits is odd.

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

The square root of 201511 is about 448.8997660948. The cubic root of 201511 is about 58.6272584573.

Adding to 201511 its reverse (115102), we get a palindrome (316613).

The spelling of 201511 in words is "two hundred one thousand, five hundred eleven".