216634631 has 8 divisors (see below), whose sum is σ = 226368864. Its totient is φ = 206926720.

The previous prime is 216634591. The next prime is 216634643. The reversal of 216634631 is 136436612.

216634631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216634631 - 2¹⁰ = 216633607 is a prime.

It is a super-2 number, since 2×216634631² = 93861126697012322, 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 (216634931) 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, 11315 + ... + 23691.

It is an arithmetic number, because the mean of its divisors is an integer number (28296108).

Almost surely, 2^216634631 is an apocalyptic number.

216634631 is a deficient number, since it is larger than the sum of its proper divisors (9734233).

216634631 is a wasteful number, since it uses less digits than its factorization.

216634631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13161.

The product of its digits is 15552, while the sum is 32.

The square root of 216634631 is about 14718.5132061632. The cubic root of 216634631 is about 600.5870467359.

The spelling of 216634631 in words is "two hundred sixteen million, six hundred thirty-four thousand, six hundred thirty-one".