979781389 has 2 divisors, whose sum is σ = 979781390. Its totient is φ = 979781388.

The previous prime is 979781353. The next prime is 979781437. The reversal of 979781389 is 983187979.

979781389 is digitally balanced in base 2, 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., 708092100 + 271689289 = 26610^2 + 16483^2 .

It is a cyclic number.

It is not a de Polignac number, because 979781389 - 2¹⁵ = 979748621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (979781339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489890694 + 489890695.

It is an arithmetic number, because the mean of its divisors is an integer number (489890695).

Almost surely, 2^979781389 is an apocalyptic number.

It is an amenable number.

979781389 is a deficient number, since it is larger than the sum of its proper divisors (1).

979781389 is an equidigital number, since it uses as much as digits as its factorization.

979781389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 61.

The square root of 979781389 is about 31301.4598541346. The cubic root of 979781389 is about 993.2145244622.

The spelling of 979781389 in words is "nine hundred seventy-nine million, seven hundred eighty-one thousand, three hundred eighty-nine".