2163555631 has 4 divisors (see below), whose sum is σ = 2277427000. Its totient is φ = 2049684264.

The previous prime is 2163555623. The next prime is 2163555679. The reversal of 2163555631 is 1365553612.

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

It is a cyclic number.

It is not a de Polignac number, because 2163555631 - 2³ = 2163555623 is a prime.

It is a super-2 number, since 2×2163555631² = 9361945936863616322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163555601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56935656 + ... + 56935693.

It is an arithmetic number, because the mean of its divisors is an integer number (569356750).

Almost surely, 2^2163555631 is an apocalyptic number.

2163555631 is a deficient number, since it is larger than the sum of its proper divisors (113871369).

2163555631 is a wasteful number, since it uses less digits than its factorization.

2163555631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113871368.

The product of its digits is 81000, while the sum is 37.

The square root of 2163555631 is about 46514.0369243522. The cubic root of 2163555631 is about 1293.3697191394.

The spelling of 2163555631 in words is "two billion, one hundred sixty-three million, five hundred fifty-five thousand, six hundred thirty-one".