19085698801 has 9 divisors (see below), whose sum is σ = 20668707531. Its totient is φ = 17615910312.

The previous prime is 19085698799. The next prime is 19085698831. The reversal of 19085698801 is 10889658091.

The square root of 19085698801 is 138151.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2823328225 + 16262370576 = 53135^2 + 127524^2 .

It is not a de Polignac number, because 19085698801 - 2¹ = 19085698799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19085698831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1790650 + ... + 1801276.

It is an arithmetic number, because the mean of its divisors is an integer number (2296523059).

Almost surely, 2^19085698801 is an apocalyptic number.

19085698801 is the 138151-st square number.

19085698801 is the 69076-th centered octagonal number.

It is an amenable number.

19085698801 is a deficient number, since it is larger than the sum of its proper divisors (1583008730).

19085698801 is an frugal number, since it uses more digits than its factorization.

19085698801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21280 (or 10640 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 55.

The spelling of 19085698801 in words is "nineteen billion, eighty-five million, six hundred ninety-eight thousand, eight hundred one".