1020198779 has 8 divisors (see below), whose sum is σ = 1066137600. Its totient is φ = 975269736.

The previous prime is 1020198757. The next prime is 1020198793. The reversal of 1020198779 is 9778910201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020198779 - 2⁸ = 1020198523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020191779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250379 + ... + 254420.

It is an arithmetic number, because the mean of its divisors is an integer number (133267200).

Almost surely, 2^1020198779 is an apocalyptic number.

1020198779 is a deficient number, since it is larger than the sum of its proper divisors (45938821).

1020198779 is an equidigital number, since it uses as much as digits as its factorization.

1020198779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504889.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 1020198779 is about 31940.5506996983. The cubic root of 1020198779 is about 1006.6880959845.

The spelling of 1020198779 in words is "one billion, twenty million, one hundred ninety-eight thousand, seven hundred seventy-nine".