216622549 has 12 divisors (see below), whose sum is σ = 256423468. Its totient is φ = 181779840.

The previous prime is 216622499. The next prime is 216622583. The reversal of 216622549 is 945226612.

It can be written as a sum of positive squares in 2 ways, for example, as 31472100 + 185150449 = 5610^2 + 13607^2 .

It is not a de Polignac number, because 216622549 - 2²³ = 208233941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216628549) 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, 67284 + ... + 70429.

Almost surely, 2^216622549 is an apocalyptic number.

It is an amenable number.

216622549 is a deficient number, since it is larger than the sum of its proper divisors (39800919).

216622549 is a wasteful number, since it uses less digits than its factorization.

216622549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137748 (or 137737 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 216622549 is about 14718.1027649626. The cubic root of 216622549 is about 600.5758813502.

The spelling of 216622549 in words is "two hundred sixteen million, six hundred twenty-two thousand, five hundred forty-nine".