216631263 has 8 divisors (see below), whose sum is σ = 296648368. Its totient is φ = 140517504.

The previous prime is 216631243. The next prime is 216631267. The reversal of 216631263 is 362136612.

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

It is not a de Polignac number, because 216631263 - 2²⁰ = 215582687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216631263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216631267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 975706 + ... + 975927.

It is an arithmetic number, because the mean of its divisors is an integer number (37081046).

Almost surely, 2^216631263 is an apocalyptic number.

216631263 is a deficient number, since it is larger than the sum of its proper divisors (80017105).

216631263 is a wasteful number, since it uses less digits than its factorization.

216631263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951673.

The product of its digits is 7776, while the sum is 30.

The square root of 216631263 is about 14718.3987919882. The cubic root of 216631263 is about 600.5839342946.

Adding to 216631263 its reverse (362136612), we get a palindrome (578767875).

The spelling of 216631263 in words is "two hundred sixteen million, six hundred thirty-one thousand, two hundred sixty-three".