1198278326281 has 9 divisors (see below), whose sum is σ = 1228263467623. Its totient is φ = 1169008239280.

The previous prime is 1198278326261. The next prime is 1198278326293. The reversal of 1198278326281 is 1826238728911.

The square root of 1198278326281 is 1094659.

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., 57739764681 + 1140538561600 = 240291^2 + 1067960^2 .

It is not a de Polignac number, because 1198278326281 - 2²³ = 1198269937673 is a prime.

It is a super-2 number, since 2×1198278326281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198278326261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 44867670 + ... + 44894368.

Almost surely, 2^{1198278326281} is an apocalyptic number.

1198278326281 is the 1094659-th square number.

1198278326281 is the 547330-th centered octagonal number.

It is an amenable number.

1198278326281 is a deficient number, since it is larger than the sum of its proper divisors (29985141342).

1198278326281 is an frugal number, since it uses more digits than its factorization.

1198278326281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53480 (or 26740 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 58.

The spelling of 1198278326281 in words is "one trillion, one hundred ninety-eight billion, two hundred seventy-eight million, three hundred twenty-six thousand, two hundred eighty-one".