1213337889 has 27 divisors (see below), whose sum is σ = 1864487443. Its totient is φ = 760195392.

The previous prime is 1213337869. The next prime is 1213337903. The reversal of 1213337889 is 9887333121.

It is a happy number.

The square root of 1213337889 is 34833.

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., 944640225 + 268697664 = 30735^2 + 16392^2 .

It is not a de Polignac number, because 1213337889 - 2⁷ = 1213337761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213337809) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1776142 + ... + 1776824.

Almost surely, 2^1213337889 is an apocalyptic number.

1213337889 is the 34833-rd square number.

1213337889 is the 17417-th centered octagonal number.

It is an amenable number.

1213337889 is a deficient number, since it is larger than the sum of its proper divisors (651149554).

1213337889 is an frugal number, since it uses more digits than its factorization.

1213337889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406 (or 703 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The cubic root of 1213337889 is about 1066.5811889295.

The spelling of 1213337889 in words is "one billion, two hundred thirteen million, three hundred thirty-seven thousand, eight hundred eighty-nine".