216435631 has 4 divisors (see below), whose sum is σ = 227827000. Its totient is φ = 205044264.

The previous prime is 216435617. The next prime is 216435643. The reversal of 216435631 is 136534612.

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 216435631 - 2¹⁷ = 216304559 is a prime.

It is a super-2 number, since 2×216435631² = 93688764732736322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216435593 and 216435602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216435691) 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, 5695656 + ... + 5695693.

It is an arithmetic number, because the mean of its divisors is an integer number (56956750).

Almost surely, 2^216435631 is an apocalyptic number.

216435631 is a deficient number, since it is larger than the sum of its proper divisors (11391369).

216435631 is a wasteful number, since it uses less digits than its factorization.

216435631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11391368.

The product of its digits is 12960, while the sum is 31.

The square root of 216435631 is about 14711.7514592927. The cubic root of 216435631 is about 600.4030911722.

The spelling of 216435631 in words is "two hundred sixteen million, four hundred thirty-five thousand, six hundred thirty-one".