8631534661 has 4 divisors (see below), whose sum is σ = 9139272012. Its totient is φ = 8123797312.

The previous prime is 8631534649. The next prime is 8631534689. The reversal of 8631534661 is 1664351368.

8631534661 = 65694² + 65695².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4315833025 + 4315701636 = 65695^2 + 65694^2 .

It is a cyclic number.

It is not a de Polignac number, because 8631534661 - 2¹³ = 8631526469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8631534761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253868650 + ... + 253868683.

It is an arithmetic number, because the mean of its divisors is an integer number (2284818003).

Almost surely, 2^8631534661 is an apocalyptic number.

8631534661 is the 65695-th centered square number.

It is an amenable number.

8631534661 is a deficient number, since it is larger than the sum of its proper divisors (507737351).

8631534661 is a wasteful number, since it uses less digits than its factorization.

8631534661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507737350.

The product of its digits is 311040, while the sum is 43.

The square root of 8631534661 is about 92906.0528760102. The cubic root of 8631534661 is about 2051.3007537769.

The spelling of 8631534661 in words is "eight billion, six hundred thirty-one million, five hundred thirty-four thousand, six hundred sixty-one".