216431471 has 8 divisors (see below), whose sum is σ = 230683104. Its totient is φ = 202348800.

The previous prime is 216431461. The next prime is 216431473. The reversal of 216431471 is 174134612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216431471 is a prime.

It is a super-3 number, since 3×216431471³ (a number of 26 digits) contains 333 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 (216431473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39590 + ... + 44723.

It is an arithmetic number, because the mean of its divisors is an integer number (28835388).

Almost surely, 2^216431471 is an apocalyptic number.

216431471 is a deficient number, since it is larger than the sum of its proper divisors (14251633).

216431471 is a wasteful number, since it uses less digits than its factorization.

216431471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84481.

The product of its digits is 4032, while the sum is 29.

The square root of 216431471 is about 14711.6100750394. The cubic root of 216431471 is about 600.3992444660.

The spelling of 216431471 in words is "two hundred sixteen million, four hundred thirty-one thousand, four hundred seventy-one".