19981153 has 2 divisors, whose sum is σ = 19981154. Its totient is φ = 19981152.

The previous prime is 19981151. The next prime is 19981163. The reversal of 19981153 is 35118991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19421649 + 559504 = 4407^2 + 748^2 .

It is a cyclic number.

It is not a de Polignac number, because 19981153 - 2¹ = 19981151 is a prime.

Together with 19981151, it forms a pair of twin primes.

It is equal to p_1269478 and since 19981153 and 1269478 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (19981151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9990576 + 9990577.

It is an arithmetic number, because the mean of its divisors is an integer number (9990577).

Almost surely, 2^19981153 is an apocalyptic number.

It is an amenable number.

19981153 is a deficient number, since it is larger than the sum of its proper divisors (1).

19981153 is an equidigital number, since it uses as much as digits as its factorization.

19981153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 37.

The square root of 19981153 is about 4470.0282996867. The cubic root of 19981153 is about 271.3564704811.

The spelling of 19981153 in words is "nineteen million, nine hundred eighty-one thousand, one hundred fifty-three".