216446131 has 24 divisors (see below), whose sum is σ = 244188000. Its totient is φ = 191664000.

The previous prime is 216446129. The next prime is 216446141. The reversal of 216446131 is 131644612.

It is not a de Polignac number, because 216446131 - 2¹ = 216446129 is a prime.

It is a super-2 number, since 2×216446131² = 93697855249738322, which contains 22 as substring.

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 216446131.

It is not an unprimeable number, because it can be changed into a prime (216446141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1087570 + ... + 1087768.

It is an arithmetic number, because the mean of its divisors is an integer number (10174500).

Almost surely, 2^216446131 is an apocalyptic number.

216446131 is a deficient number, since it is larger than the sum of its proper divisors (27741869).

216446131 is a wasteful number, since it uses less digits than its factorization.

216446131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 400 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 216446131 is about 14712.1083125431. The cubic root of 216446131 is about 600.4128001875.

The spelling of 216446131 in words is "two hundred sixteen million, four hundred forty-six thousand, one hundred thirty-one".