1017978019 has 2 divisors, whose sum is σ = 1017978020. Its totient is φ = 1017978018.

The previous prime is 1017977959. The next prime is 1017978083. The reversal of 1017978019 is 9108797101.

It is a weak prime.

It is an emirp because it is prime and its reverse (9108797101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1017978019 - 2¹¹ = 1017975971 is a prime.

It is a super-2 number, since 2×1017978019² = 2072558494334328722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1017978119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 508989009 + 508989010.

It is an arithmetic number, because the mean of its divisors is an integer number (508989010).

Almost surely, 2^1017978019 is an apocalyptic number.

1017978019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1017978019 is an equidigital number, since it uses as much as digits as its factorization.

1017978019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 43.

The square root of 1017978019 is about 31905.7678014493. The cubic root of 1017978019 is about 1005.9571153100.

The spelling of 1017978019 in words is "one billion, seventeen million, nine hundred seventy-eight thousand, nineteen".