8521861261 has 8 divisors (see below), whose sum is σ = 8893339200. Its totient is φ = 8150463552.

The previous prime is 8521861211. The next prime is 8521861267. The reversal of 8521861261 is 1621681258.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8521861261 - 2⁹ = 8521860749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521861267) 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 in 7 ways as a sum of consecutive naturals, for example, 319506 + ... + 345148.

It is an arithmetic number, because the mean of its divisors is an integer number (1111667400).

Almost surely, 2^8521861261 is an apocalyptic number.

It is an amenable number.

8521861261 is a deficient number, since it is larger than the sum of its proper divisors (371477939).

8521861261 is a wasteful number, since it uses less digits than its factorization.

8521861261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40115.

The product of its digits is 46080, while the sum is 40.

The square root of 8521861261 is about 92313.9277736572. The cubic root of 8521861261 is about 2042.5756634927.

The spelling of 8521861261 in words is "eight billion, five hundred twenty-one million, eight hundred sixty-one thousand, two hundred sixty-one".