19881151 has 2 divisors, whose sum is σ = 19881152. Its totient is φ = 19881150.

The previous prime is 19881149. The next prime is 19881161. The reversal of 19881151 is 15118891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19881151 - 2¹ = 19881149 is a prime.

Together with 19881149, 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 (19881101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940575 + 9940576.

It is an arithmetic number, because the mean of its divisors is an integer number (9940576).

Almost surely, 2^19881151 is an apocalyptic number.

19881151 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881151 is an equidigital number, since it uses as much as digits as its factorization.

19881151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 34.

The square root of 19881151 is about 4458.8284335686. The cubic root of 19881151 is about 270.9030167256.

The spelling of 19881151 in words is "nineteen million, eight hundred eighty-one thousand, one hundred fifty-one".