216996453 has 12 divisors (see below), whose sum is σ = 321911148. Its totient is φ = 140754240.

The previous prime is 216996433. The next prime is 216996463. The reversal of 216996453 is 354699612.

It can be written as a sum of positive squares in 2 ways, for example, as 131951169 + 85045284 = 11487^2 + 9222^2 .

It is not a de Polignac number, because 216996453 - 2⁶ = 216996389 is a prime.

It is a super-2 number, since 2×216996453² = 94174921229162418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216996399 and 216996408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216996413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325488 + ... + 326153.

It is an arithmetic number, because the mean of its divisors is an integer number (26825929).

Almost surely, 2^216996453 is an apocalyptic number.

It is an amenable number.

216996453 is a deficient number, since it is larger than the sum of its proper divisors (104914695).

216996453 is a wasteful number, since it uses less digits than its factorization.

216996453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651684 (or 651681 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 216996453 is about 14730.7994691395. The cubic root of 216996453 is about 600.9212265123.

The spelling of 216996453 in words is "two hundred sixteen million, nine hundred ninety-six thousand, four hundred fifty-three".