961578389 has 2 divisors, whose sum is σ = 961578390. Its totient is φ = 961578388.

The previous prime is 961578307. The next prime is 961578403. The reversal of 961578389 is 983875169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823116100 + 138462289 = 28690^2 + 11767^2 .

It is an emirp because it is prime and its reverse (983875169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961578389 - 2²⁰ = 960529813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961578589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480789194 + 480789195.

It is an arithmetic number, because the mean of its divisors is an integer number (480789195).

Almost surely, 2^961578389 is an apocalyptic number.

It is an amenable number.

961578389 is a deficient number, since it is larger than the sum of its proper divisors (1).

961578389 is an equidigital number, since it uses as much as digits as its factorization.

961578389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 56.

The square root of 961578389 is about 31009.3274515911. The cubic root of 961578389 is about 987.0251784248.

The spelling of 961578389 in words is "nine hundred sixty-one million, five hundred seventy-eight thousand, three hundred eighty-nine".