216552631 has 2 divisors, whose sum is σ = 216552632. Its totient is φ = 216552630.

The previous prime is 216552619. The next prime is 216552673. The reversal of 216552631 is 136255612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216552631 - 2⁷ = 216552503 is a prime.

It is a super-3 number, since 3×216552631³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 216552593 and 216552602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216552691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108276315 + 108276316.

It is an arithmetic number, because the mean of its divisors is an integer number (108276316).

Almost surely, 2^216552631 is an apocalyptic number.

216552631 is a deficient number, since it is larger than the sum of its proper divisors (1).

216552631 is an equidigital number, since it uses as much as digits as its factorization.

216552631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 216552631 is about 14715.7273350657. The cubic root of 216552631 is about 600.5112596027.

The spelling of 216552631 in words is "two hundred sixteen million, five hundred fifty-two thousand, six hundred thirty-one".