5631147661 has 4 divisors (see below), whose sum is σ = 5875980192. Its totient is φ = 5386315132.

The previous prime is 5631147659. The next prime is 5631147673. The reversal of 5631147661 is 1667411365.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5631147661 - 2¹ = 5631147659 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631147461) 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 3 ways as a sum of consecutive naturals, for example, 122416231 + ... + 122416276.

It is an arithmetic number, because the mean of its divisors is an integer number (1468995048).

Almost surely, 2^5631147661 is an apocalyptic number.

It is an amenable number.

5631147661 is a deficient number, since it is larger than the sum of its proper divisors (244832531).

5631147661 is a wasteful number, since it uses less digits than its factorization.

5631147661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244832530.

The product of its digits is 90720, while the sum is 40.

The square root of 5631147661 is about 75040.9732146379. The cubic root of 5631147661 is about 1779.0943148513.

The spelling of 5631147661 in words is "five billion, six hundred thirty-one million, one hundred forty-seven thousand, six hundred sixty-one".