789561421 has 6 divisors (see below), whose sum is σ = 867865166. Its totient is φ = 717783000.

The previous prime is 789561407. The next prime is 789561431. The reversal of 789561421 is 124165987.

789561421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 786802500 + 2758921 = 28050^2 + 1661^2 .

It is not a de Polignac number, because 789561421 - 2⁷ = 789561293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (789561401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3262530 + ... + 3262771.

Almost surely, 2^789561421 is an apocalyptic number.

It is an amenable number.

789561421 is a deficient number, since it is larger than the sum of its proper divisors (78303745).

789561421 is a wasteful number, since it uses less digits than its factorization.

789561421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6525323 (or 6525312 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 789561421 is about 28099.1355916868. The cubic root of 789561421 is about 924.2624443471.

The spelling of 789561421 in words is "seven hundred eighty-nine million, five hundred sixty-one thousand, four hundred twenty-one".