1209597433489 has 3 divisors (see below), whose sum is σ = 1209598533307. Its totient is φ = 1209596333672.

The previous prime is 1209597433469. The next prime is 1209597433501. The reversal of 1209597433489 is 9843347959021.

The square root of 1209597433489 is 1099817.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 667595214225 + 542002219264 = 817065^2 + 736208^2 .

It is not a de Polignac number, because 1209597433489 - 2²¹ = 1209595336337 is a prime.

It is a super-2 number, since 2×1209597433489² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1209597433489.

It is not an unprimeable number, because it can be changed into a prime (1209597433469) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 549909 + ... + 1649725.

Almost surely, 2^{1209597433489} is an apocalyptic number.

1209597433489 is the 1099817-th square number.

1209597433489 is the 549909-th centered octagonal number.

It is an amenable number.

1209597433489 is a deficient number, since it is larger than the sum of its proper divisors (1099818).

1209597433489 is an frugal number, since it uses more digits than its factorization.

1209597433489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199634 (or 1099817 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 64.

Multiplying 1209597433489 by its sum of digits (64), we get a square (77414235743296 = 8798536²).

The spelling of 1209597433489 in words is "one trillion, two hundred nine billion, five hundred ninety-seven million, four hundred thirty-three thousand, four hundred eighty-nine".