798149509 has 2 divisors, whose sum is σ = 798149510. Its totient is φ = 798149508.

The previous prime is 798149477. The next prime is 798149543. The reversal of 798149509 is 905941897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 796932900 + 1216609 = 28230^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 798149509 - 2⁵ = 798149477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (798149579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399074754 + 399074755.

It is an arithmetic number, because the mean of its divisors is an integer number (399074755).

Almost surely, 2^798149509 is an apocalyptic number.

It is an amenable number.

798149509 is a deficient number, since it is larger than the sum of its proper divisors (1).

798149509 is an equidigital number, since it uses as much as digits as its factorization.

798149509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 798149509 is about 28251.5399403289. The cubic root of 798149509 is about 927.6014459310.

The spelling of 798149509 in words is "seven hundred ninety-eight million, one hundred forty-nine thousand, five hundred nine".