1081398249409 has 9 divisors (see below), whose sum is σ = 1087866217699. Its totient is φ = 1074968529160.

The previous prime is 1081398249367. The next prime is 1081398249541. The reversal of 1081398249409 is 9049428931801.

The square root of 1081398249409 is 1039903.

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., 983696994225 + 97701255184 = 991815^2 + 312572^2 .

It is not a de Polignac number, because 1081398249409 - 2¹⁷ = 1081398118337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081398229409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 179900214 + ... + 179906224.

Almost surely, 2^{1081398249409} is an apocalyptic number.

1081398249409 is the 1039903-rd square number.

1081398249409 is the 519952-nd centered octagonal number.

It is an amenable number.

1081398249409 is a deficient number, since it is larger than the sum of its proper divisors (6467968290).

1081398249409 is an frugal number, since it uses more digits than its factorization.

1081398249409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12368 (or 6184 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 58.

The spelling of 1081398249409 in words is "one trillion, eighty-one billion, three hundred ninety-eight million, two hundred forty-nine thousand, four hundred nine".