1211934789 has 12 divisors (see below), whose sum is σ = 1885232076. Its totient is φ = 745805952.

The previous prime is 1211934769. The next prime is 1211934847. The reversal of 1211934789 is 9874391121.

It can be written as a sum of positive squares in 2 ways, for example, as 648109764 + 563825025 = 25458^2 + 23745^2 .

It is not a de Polignac number, because 1211934789 - 2²⁹ = 675063877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211934769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5179092 + ... + 5179325.

It is an arithmetic number, because the mean of its divisors is an integer number (157102673).

Almost surely, 2^1211934789 is an apocalyptic number.

It is an amenable number.

1211934789 is a deficient number, since it is larger than the sum of its proper divisors (673297287).

1211934789 is a wasteful number, since it uses less digits than its factorization.

1211934789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10358436 (or 10358433 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1211934789 is about 34812.8537899437. The cubic root of 1211934789 is about 1066.1699000083.

The spelling of 1211934789 in words is "one billion, two hundred eleven million, nine hundred thirty-four thousand, seven hundred eighty-nine".