863213081 has 2 divisors, whose sum is σ = 863213082. Its totient is φ = 863213080.

The previous prime is 863213017. The next prime is 863213123. The reversal of 863213081 is 180312368.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504451600 + 358761481 = 22460^2 + 18941^2 .

It is a cyclic number.

It is not a de Polignac number, because 863213081 - 2⁶ = 863213017 is a prime.

It is a super-2 number, since 2×863213081² = 1490273646419025122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (863213381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431606540 + 431606541.

It is an arithmetic number, because the mean of its divisors is an integer number (431606541).

Almost surely, 2^863213081 is an apocalyptic number.

It is an amenable number.

863213081 is a deficient number, since it is larger than the sum of its proper divisors (1).

863213081 is an equidigital number, since it uses as much as digits as its factorization.

863213081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 863213081 is about 29380.4881000980. The cubic root of 863213081 is about 952.1513868572.

The spelling of 863213081 in words is "eight hundred sixty-three million, two hundred thirteen thousand, eighty-one".