189810913 has 2 divisors, whose sum is σ = 189810914. Its totient is φ = 189810912.

The previous prime is 189810911. The next prime is 189810919. The reversal of 189810913 is 319018981.

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., 189805729 + 5184 = 13777^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 189810913 - 2¹ = 189810911 is a prime.

Together with 189810911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189810911) 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, 94905456 + 94905457.

It is an arithmetic number, because the mean of its divisors is an integer number (94905457).

Almost surely, 2^189810913 is an apocalyptic number.

It is an amenable number.

189810913 is a deficient number, since it is larger than the sum of its proper divisors (1).

189810913 is an equidigital number, since it uses as much as digits as its factorization.

189810913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 189810913 is about 13777.1881383684. The cubic root of 189810913 is about 574.6989355247.

The spelling of 189810913 in words is "one hundred eighty-nine million, eight hundred ten thousand, nine hundred thirteen".