780129089 has 2 divisors, whose sum is σ = 780129090. Its totient is φ = 780129088.

The previous prime is 780129083. The next prime is 780129109. The reversal of 780129089 is 980921087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 503239489 + 276889600 = 22433^2 + 16640^2 .

It is a cyclic number.

It is not a de Polignac number, because 780129089 - 2¹⁶ = 780063553 is a prime.

It is not a weakly prime, because it can be changed into another prime (780129083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390064544 + 390064545.

It is an arithmetic number, because the mean of its divisors is an integer number (390064545).

Almost surely, 2^780129089 is an apocalyptic number.

It is an amenable number.

780129089 is a deficient number, since it is larger than the sum of its proper divisors (1).

780129089 is an equidigital number, since it uses as much as digits as its factorization.

780129089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 780129089 is about 27930.7910557506. The cubic root of 780129089 is about 920.5671868789.

The spelling of 780129089 in words is "seven hundred eighty million, one hundred twenty-nine thousand, eighty-nine".