863471509 has 2 divisors, whose sum is σ = 863471510. Its totient is φ = 863471508.

The previous prime is 863471507. The next prime is 863471561. The reversal of 863471509 is 905174368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741037284 + 122434225 = 27222^2 + 11065^2 .

It is a cyclic number.

It is not a de Polignac number, because 863471509 - 2¹ = 863471507 is a prime.

Together with 863471507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863471507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431735754 + 431735755.

It is an arithmetic number, because the mean of its divisors is an integer number (431735755).

Almost surely, 2^863471509 is an apocalyptic number.

It is an amenable number.

863471509 is a deficient number, since it is larger than the sum of its proper divisors (1).

863471509 is an equidigital number, since it uses as much as digits as its factorization.

863471509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 863471509 is about 29384.8857237866. The cubic root of 863471509 is about 952.2463954682.

The spelling of 863471509 in words is "eight hundred sixty-three million, four hundred seventy-one thousand, five hundred nine".