2151538111 has 2 divisors, whose sum is σ = 2151538112. Its totient is φ = 2151538110.

The previous prime is 2151538091. The next prime is 2151538163. The reversal of 2151538111 is 1118351512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2151538111 - 2²¹ = 2149440959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2151538111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151538811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075769055 + 1075769056.

It is an arithmetic number, because the mean of its divisors is an integer number (1075769056).

Almost surely, 2^2151538111 is an apocalyptic number.

2151538111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151538111 is an equidigital number, since it uses as much as digits as its factorization.

2151538111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 28.

The square root of 2151538111 is about 46384.6753896155. The cubic root of 2151538111 is about 1290.9705875829.

Adding to 2151538111 its reverse (1118351512), we get a palindrome (3269889623).

The spelling of 2151538111 in words is "two billion, one hundred fifty-one million, five hundred thirty-eight thousand, one hundred eleven".