216952761 has 4 divisors (see below), whose sum is σ = 289270352. Its totient is φ = 144635172.

The previous prime is 216952739. The next prime is 216952763. The reversal of 216952761 is 167259612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216952761 - 2¹⁹ = 216428473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216952763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36158791 + ... + 36158796.

It is an arithmetic number, because the mean of its divisors is an integer number (72317588).

Almost surely, 2^216952761 is an apocalyptic number.

It is an amenable number.

216952761 is a deficient number, since it is larger than the sum of its proper divisors (72317591).

216952761 is an equidigital number, since it uses as much as digits as its factorization.

216952761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72317590.

The product of its digits is 45360, while the sum is 39.

The square root of 216952761 is about 14729.3163792486. The cubic root of 216952761 is about 600.8808921931.

It can be divided in two parts, 21695 and 2761, that multiplied together give a palindrome (59899895).

The spelling of 216952761 in words is "two hundred sixteen million, nine hundred fifty-two thousand, seven hundred sixty-one".