798505909 has 2 divisors, whose sum is σ = 798505910. Its totient is φ = 798505908.

The previous prime is 798505871. The next prime is 798505919. The reversal of 798505909 is 909505897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715295025 + 83210884 = 26745^2 + 9122^2 .

It is a cyclic number.

It is not a de Polignac number, because 798505909 - 2¹⁵ = 798473141 is a prime.

It is a super-2 number, since 2×798505909² = 1275223373415832562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (798505919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399252954 + 399252955.

It is an arithmetic number, because the mean of its divisors is an integer number (399252955).

Almost surely, 2^798505909 is an apocalyptic number.

It is an amenable number.

798505909 is a deficient number, since it is larger than the sum of its proper divisors (1).

798505909 is an equidigital number, since it uses as much as digits as its factorization.

798505909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The square root of 798505909 is about 28257.8468571121. The cubic root of 798505909 is about 927.7394935675.

The spelling of 798505909 in words is "seven hundred ninety-eight million, five hundred five thousand, nine hundred nine".