863640361 has 2 divisors, whose sum is σ = 863640362. Its totient is φ = 863640360.

The previous prime is 863640287. The next prime is 863640367. The reversal of 863640361 is 163046368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 740873961 + 122766400 = 27219^2 + 11080^2 .

It is a cyclic number.

It is not a de Polignac number, because 863640361 - 2¹¹ = 863638313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 863640361.

It is not a weakly prime, because it can be changed into another prime (863640367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431820180 + 431820181.

It is an arithmetic number, because the mean of its divisors is an integer number (431820181).

Almost surely, 2^863640361 is an apocalyptic number.

It is an amenable number.

863640361 is a deficient number, since it is larger than the sum of its proper divisors (1).

863640361 is an equidigital number, since it uses as much as digits as its factorization.

863640361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 863640361 is about 29387.7586930341. The cubic root of 863640361 is about 952.3084620707.

The spelling of 863640361 in words is "eight hundred sixty-three million, six hundred forty thousand, three hundred sixty-one".