865523061 has 12 divisors (see below), whose sum is σ = 1346369388. Its totient is φ = 532629504.

The previous prime is 865523059. The next prime is 865523081. The reversal of 865523061 is 160325568.

It can be written as a sum of positive squares in 2 ways, for example, as 225180036 + 640343025 = 15006^2 + 25305^2 .

It is not a de Polignac number, because 865523061 - 2¹ = 865523059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865523011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3698700 + ... + 3698933.

It is an arithmetic number, because the mean of its divisors is an integer number (112197449).

Almost surely, 2^865523061 is an apocalyptic number.

It is an amenable number.

865523061 is a deficient number, since it is larger than the sum of its proper divisors (480846327).

865523061 is a wasteful number, since it uses less digits than its factorization.

865523061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7397652 (or 7397649 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 865523061 is about 29419.7732996024. The cubic root of 865523061 is about 952.9999574254. Note that the first 4 decimals are identical.

The spelling of 865523061 in words is "eight hundred sixty-five million, five hundred twenty-three thousand, sixty-one".