20181151 has 2 divisors, whose sum is σ = 20181152. Its totient is φ = 20181150.

The previous prime is 20181149. The next prime is 20181157. The reversal of 20181151 is 15118102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20181151 - 2¹ = 20181149 is a prime.

Together with 20181149, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20181157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10090575 + 10090576.

It is an arithmetic number, because the mean of its divisors is an integer number (10090576).

Almost surely, 2^20181151 is an apocalyptic number.

20181151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20181151 is an equidigital number, since it uses as much as digits as its factorization.

20181151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 20181151 is about 4492.3435977227. The cubic root of 20181151 is about 272.2588321596.

Adding to 20181151 its reverse (15118102), we get a palindrome (35299253).

The spelling of 20181151 in words is "twenty million, one hundred eighty-one thousand, one hundred fifty-one".