919899977 has 2 divisors, whose sum is σ = 919899978. Its totient is φ = 919899976.

The previous prime is 919899943. The next prime is 919899979. The reversal of 919899977 is 779998919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 783384121 + 136515856 = 27989^2 + 11684^2 .

It is a cyclic number.

It is not a de Polignac number, because 919899977 - 2⁶ = 919899913 is a prime.

Together with 919899979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (919899979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459949988 + 459949989.

It is an arithmetic number, because the mean of its divisors is an integer number (459949989).

Almost surely, 2^919899977 is an apocalyptic number.

It is an amenable number.

919899977 is a deficient number, since it is larger than the sum of its proper divisors (1).

919899977 is an equidigital number, since it uses as much as digits as its factorization.

919899977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23147208, while the sum is 68.

The square root of 919899977 is about 30329.8529010610. The cubic root of 919899977 is about 972.5535781109.

The spelling of 919899977 in words is "nine hundred nineteen million, eight hundred ninety-nine thousand, nine hundred seventy-seven".