1098289221581 has 2 divisors, whose sum is σ = 1098289221582. Its totient is φ = 1098289221580.

The previous prime is 1098289221571. The next prime is 1098289221607. The reversal of 1098289221581 is 1851229828901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733635075625 + 364654145956 = 856525^2 + 603866^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098289221581 - 2¹⁰ = 1098289220557 is a prime.

It is a super-2 number, since 2×1098289221581² (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 (1098289221521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549144610790 + 549144610791.

It is an arithmetic number, because the mean of its divisors is an integer number (549144610791).

Almost surely, 2^{1098289221581} is an apocalyptic number.

It is an amenable number.

1098289221581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098289221581 is an equidigital number, since it uses as much as digits as its factorization.

1098289221581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 56.

The spelling of 1098289221581 in words is "one trillion, ninety-eight billion, two hundred eighty-nine million, two hundred twenty-one thousand, five hundred eighty-one".