1019978128423 has 2 divisors, whose sum is σ = 1019978128424. Its totient is φ = 1019978128422.

The previous prime is 1019978128399. The next prime is 1019978128537. The reversal of 1019978128423 is 3248218799101.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1019978128423 is a prime.

It is a super-2 number, since 2×1019978128423² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019978108423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509989064211 + 509989064212.

It is an arithmetic number, because the mean of its divisors is an integer number (509989064212).

Almost surely, 2^{1019978128423} is an apocalyptic number.

1019978128423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019978128423 is an equidigital number, since it uses as much as digits as its factorization.

1019978128423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 1019978128423 in words is "one trillion, nineteen billion, nine hundred seventy-eight million, one hundred twenty-eight thousand, four hundred twenty-three".