1019191028 has 12 divisors (see below), whose sum is σ = 1801972452. Its totient is φ = 504341760.

The previous prime is 1019191009. The next prime is 1019191039. The reversal of 1019191028 is 8201919101.

It can be written as a sum of positive squares in 2 ways, for example, as 405539044 + 613651984 = 20138^2 + 24772^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1019190985 and 1019191003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313003 + ... + 1313778.

It is an arithmetic number, because the mean of its divisors is an integer number (150164371).

Almost surely, 2^1019191028 is an apocalyptic number.

It is an amenable number.

1019191028 is a deficient number, since it is larger than the sum of its proper divisors (782781424).

1019191028 is a wasteful number, since it uses less digits than its factorization.

1019191028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626882 (or 2626880 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 1019191028 is about 31924.7713852425. The cubic root of 1019191028 is about 1006.3565183948.

The spelling of 1019191028 in words is "one billion, nineteen million, one hundred ninety-one thousand, twenty-eight".