919912289 has 2 divisors, whose sum is σ = 919912290. Its totient is φ = 919912288.

The previous prime is 919912267. The next prime is 919912309. The reversal of 919912289 is 982219919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462594064 + 457318225 = 21508^2 + 21385^2 .

It is an emirp because it is prime and its reverse (982219919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919912289 - 2⁸ = 919912033 is a prime.

It is not a weakly prime, because it can be changed into another prime (919912249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459956144 + 459956145.

It is an arithmetic number, because the mean of its divisors is an integer number (459956145).

Almost surely, 2^919912289 is an apocalyptic number.

It is an amenable number.

919912289 is a deficient number, since it is larger than the sum of its proper divisors (1).

919912289 is an equidigital number, since it uses as much as digits as its factorization.

919912289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 50.

The square root of 919912289 is about 30330.0558687253. The cubic root of 919912289 is about 972.5579169980.

The spelling of 919912289 in words is "nine hundred nineteen million, nine hundred twelve thousand, two hundred eighty-nine".