865970617 has 2 divisors, whose sum is σ = 865970618. Its totient is φ = 865970616.

The previous prime is 865970569. The next prime is 865970621. The reversal of 865970617 is 716079568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850947241 + 15023376 = 29171^2 + 3876^2 .

It is a cyclic number.

It is not a de Polignac number, because 865970617 - 2⁷ = 865970489 is a prime.

It is not a weakly prime, because it can be changed into another prime (865970627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432985308 + 432985309.

It is an arithmetic number, because the mean of its divisors is an integer number (432985309).

Almost surely, 2^865970617 is an apocalyptic number.

It is an amenable number.

865970617 is a deficient number, since it is larger than the sum of its proper divisors (1).

865970617 is an equidigital number, since it uses as much as digits as its factorization.

865970617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 865970617 is about 29427.3786973967. The cubic root of 865970617 is about 953.1641923535.

Subtracting from 865970617 its reverse (716079568), we obtain a square (149891049 = 12243²).

The spelling of 865970617 in words is "eight hundred sixty-five million, nine hundred seventy thousand, six hundred seventeen".