1161258398689 has 9 divisors (see below), whose sum is σ = 1168197217113. Its totient is φ = 1154360572272.

The previous prime is 1161258398687. The next prime is 1161258398701. The reversal of 1161258398689 is 9868938521611.

The square root of 1161258398689 is 1077617.

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

It can be written as a sum of positive squares in 4 ways, for example, as 253034150625 + 908224248064 = 503025^2 + 953008^2 .

It is not a de Polignac number, because 1161258398689 - 2¹ = 1161258398687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161258398683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 186424627 + ... + 186430855.

Almost surely, 2^{1161258398689} is an apocalyptic number.

1161258398689 is the 1077617-th square number.

1161258398689 is the 538809-th centered octagonal number.

It is an amenable number.

1161258398689 is a deficient number, since it is larger than the sum of its proper divisors (6938818424).

1161258398689 is an frugal number, since it uses more digits than its factorization.

1161258398689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804 (or 6402 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 67.

The spelling of 1161258398689 in words is "one trillion, one hundred sixty-one billion, two hundred fifty-eight million, three hundred ninety-eight thousand, six hundred eighty-nine".