985576391 has 2 divisors, whose sum is σ = 985576392. Its totient is φ = 985576390.

The previous prime is 985576369. The next prime is 985576439. The reversal of 985576391 is 193675589.

It is a weak prime.

It is an emirp because it is prime and its reverse (193675589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985576391 - 2¹⁸ = 985314247 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985576331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492788195 + 492788196.

It is an arithmetic number, because the mean of its divisors is an integer number (492788196).

Almost surely, 2^985576391 is an apocalyptic number.

985576391 is a deficient number, since it is larger than the sum of its proper divisors (1).

985576391 is an equidigital number, since it uses as much as digits as its factorization.

985576391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 53.

The square root of 985576391 is about 31393.8909821640. The cubic root of 985576391 is about 995.1688276944.

The spelling of 985576391 in words is "nine hundred eighty-five million, five hundred seventy-six thousand, three hundred ninety-one".