865564331 has 2 divisors, whose sum is σ = 865564332. Its totient is φ = 865564330.

The previous prime is 865564307. The next prime is 865564387. The reversal of 865564331 is 133465568.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865564331 is a prime.

It is a super-2 number, since 2×865564331² = 1498403222198955122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (865564631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432782165 + 432782166.

It is an arithmetic number, because the mean of its divisors is an integer number (432782166).

Almost surely, 2^865564331 is an apocalyptic number.

865564331 is a deficient number, since it is larger than the sum of its proper divisors (1).

865564331 is an equidigital number, since it uses as much as digits as its factorization.

865564331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The square root of 865564331 is about 29420.4746902561. The cubic root of 865564331 is about 953.0151042134.

The spelling of 865564331 in words is "eight hundred sixty-five million, five hundred sixty-four thousand, three hundred thirty-one".