189918911929 has 2 divisors, whose sum is σ = 189918911930. Its totient is φ = 189918911928.

The previous prime is 189918911927. The next prime is 189918911953. The reversal of 189918911929 is 929119819981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103377039529 + 86541872400 = 321523^2 + 294180^2 .

It is a cyclic number.

It is not a de Polignac number, because 189918911929 - 2¹ = 189918911927 is a prime.

Together with 189918911927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189918911927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94959455964 + 94959455965.

It is an arithmetic number, because the mean of its divisors is an integer number (94959455965).

Almost surely, 2^189918911929 is an apocalyptic number.

It is an amenable number.

189918911929 is a deficient number, since it is larger than the sum of its proper divisors (1).

189918911929 is an equidigital number, since it uses as much as digits as its factorization.

189918911929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 67.

The spelling of 189918911929 in words is "one hundred eighty-nine billion, nine hundred eighteen million, nine hundred eleven thousand, nine hundred twenty-nine".