12961789 has 2 divisors, whose sum is σ = 12961790. Its totient is φ = 12961788.

The previous prime is 12961787. The next prime is 12961841. The reversal of 12961789 is 98716921.

12961789 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12545764 + 416025 = 3542^2 + 645^2 .

It is an emirp because it is prime and its reverse (98716921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12961789 - 2¹ = 12961787 is a prime.

Together with 12961787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12961787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6480894 + 6480895.

It is an arithmetic number, because the mean of its divisors is an integer number (6480895).

Almost surely, 2^12961789 is an apocalyptic number.

It is an amenable number.

12961789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12961789 is an equidigital number, since it uses as much as digits as its factorization.

12961789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 12961789 is about 3600.2484636480. The cubic root of 12961789 is about 234.9028661491.

The spelling of 12961789 in words is "twelve million, nine hundred sixty-one thousand, seven hundred eighty-nine".