216532051 has 4 divisors (see below), whose sum is σ = 225946512. Its totient is φ = 207117592.

The previous prime is 216532031. The next prime is 216532061. The reversal of 216532051 is 150235612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216532051 is a prime.

It is a super-2 number, since 2×216532051² = 93772258220533202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216532031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4707196 + ... + 4707241.

It is an arithmetic number, because the mean of its divisors is an integer number (56486628).

Almost surely, 2^216532051 is an apocalyptic number.

216532051 is a deficient number, since it is larger than the sum of its proper divisors (9414461).

216532051 is an equidigital number, since it uses as much as digits as its factorization.

216532051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9414460.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 216532051 is about 14715.0280665719. The cubic root of 216532051 is about 600.4922358775.

Adding to 216532051 its reverse (150235612), we get a palindrome (366767663).

The spelling of 216532051 in words is "two hundred sixteen million, five hundred thirty-two thousand, fifty-one".