865781201 has 2 divisors, whose sum is σ = 865781202. Its totient is φ = 865781200.

The previous prime is 865781197. The next prime is 865781239. The reversal of 865781201 is 102187568.

It is an a-pointer prime, because the next prime (865781239) can be obtained adding 865781201 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511438225 + 354342976 = 22615^2 + 18824^2 .

It is a cyclic number.

It is not a de Polignac number, because 865781201 - 2² = 865781197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (865781291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432890600 + 432890601.

It is an arithmetic number, because the mean of its divisors is an integer number (432890601).

Almost surely, 2^865781201 is an apocalyptic number.

It is an amenable number.

865781201 is a deficient number, since it is larger than the sum of its proper divisors (1).

865781201 is an equidigital number, since it uses as much as digits as its factorization.

865781201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 865781201 is about 29424.1601579382. The cubic root of 865781201 is about 953.0946912602.

The spelling of 865781201 in words is "eight hundred sixty-five million, seven hundred eighty-one thousand, two hundred one".