980895809 has 2 divisors, whose sum is σ = 980895810. Its totient is φ = 980895808.

The previous prime is 980895779. The next prime is 980895823. The reversal of 980895809 is 908598089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975000625 + 5895184 = 31225^2 + 2428^2 .

It is a cyclic number.

It is not a de Polignac number, because 980895809 - 2¹⁶ = 980830273 is a prime.

It is a super-2 number, since 2×980895809² = 1924313176227528962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (980895859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490447904 + 490447905.

It is an arithmetic number, because the mean of its divisors is an integer number (490447905).

Almost surely, 2^980895809 is an apocalyptic number.

It is an amenable number.

980895809 is a deficient number, since it is larger than the sum of its proper divisors (1).

980895809 is an equidigital number, since it uses as much as digits as its factorization.

980895809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 56.

The square root of 980895809 is about 31319.2562012574. The cubic root of 980895809 is about 993.5909481402.

The spelling of 980895809 in words is "nine hundred eighty million, eight hundred ninety-five thousand, eight hundred nine".