1209632627889 has 81 divisors (see below), whose sum is σ = 2060560639449. Its totient is φ = 681808473360.

The previous prime is 1209632627887. The next prime is 1209632627897. The reversal of 1209632627889 is 9887262369021.

The square root of 1209632627889 is 1099833.

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

1209632627889 is a `hidden beast` number, since 1 + 209 + 6 + 326 + 27 + 8 + 89 = 666.

It is not a de Polignac number, because 1209632627889 - 2¹ = 1209632627887 is a prime.

It is a super-2 number, since 2×1209632627889² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1209632627887) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1917008604 + ... + 1917009234.

Almost surely, 2^{1209632627889} is an apocalyptic number.

1209632627889 is the 1099833-rd square number.

1209632627889 is the 549917-th centered octagonal number.

It is an amenable number.

1209632627889 is a deficient number, since it is larger than the sum of its proper divisors (850928011560).

1209632627889 is an frugal number, since it uses more digits than its factorization.

1209632627889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 1209632627889 in words is "one trillion, two hundred nine billion, six hundred thirty-two million, six hundred twenty-seven thousand, eight hundred eighty-nine".