216226431 has 6 divisors (see below), whose sum is σ = 312327080. Its totient is φ = 144150948.

The previous prime is 216226429. The next prime is 216226463. The reversal of 216226431 is 134622612.

216226431 is a `hidden beast` number, since 2 + 1 + 6 + 226 + 431 = 666.

It is not a de Polignac number, because 216226431 - 2¹ = 216226429 is a prime.

It is a super-2 number, since 2×216226431² = 93507738925995522, 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 = 216226395 and 216226404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216226471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12012571 + ... + 12012588.

Almost surely, 2^216226431 is an apocalyptic number.

216226431 is a deficient number, since it is larger than the sum of its proper divisors (96100649).

216226431 is a wasteful number, since it uses less digits than its factorization.

216226431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24025165 (or 24025162 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 216226431 is about 14704.6397779748. The cubic root of 216226431 is about 600.2095851149.

The spelling of 216226431 in words is "two hundred sixteen million, two hundred twenty-six thousand, four hundred thirty-one".