863480809 has 2 divisors, whose sum is σ = 863480810. Its totient is φ = 863480808.

The previous prime is 863480749. The next prime is 863480819. The reversal of 863480809 is 908084368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538472025 + 325008784 = 23205^2 + 18028^2 .

It is a cyclic number.

It is not a de Polignac number, because 863480809 - 2²³ = 855092201 is a prime.

It is a super-2 number, since 2×863480809² = 1491198215022588962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (863480819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431740404 + 431740405.

It is an arithmetic number, because the mean of its divisors is an integer number (431740405).

Almost surely, 2^863480809 is an apocalyptic number.

It is an amenable number.

863480809 is a deficient number, since it is larger than the sum of its proper divisors (1).

863480809 is an equidigital number, since it uses as much as digits as its factorization.

863480809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 863480809 is about 29385.0439679780. The cubic root of 863480809 is about 952.2498141719.

The spelling of 863480809 in words is "eight hundred sixty-three million, four hundred eighty thousand, eight hundred nine".