216572797 has 6 divisors (see below), whose sum is σ = 251931678. Its totient is φ = 185633784.

The previous prime is 216572779. The next prime is 216572819. The reversal of 216572797 is 797275612.

It can be written as a sum of positive squares in only one way, i.e., 214651801 + 1920996 = 14651^2 + 1386^2 .

It is not a de Polignac number, because 216572797 - 2¹⁵ = 216540029 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 (216572717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2209878 + ... + 2209975.

It is an arithmetic number, because the mean of its divisors is an integer number (41988613).

Almost surely, 2^216572797 is an apocalyptic number.

It is an amenable number.

216572797 is a deficient number, since it is larger than the sum of its proper divisors (35358881).

216572797 is an equidigital number, since it uses as much as digits as its factorization.

216572797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4419867 (or 4419860 counting only the distinct ones).

The product of its digits is 370440, while the sum is 46.

The square root of 216572797 is about 14716.4125044115. The cubic root of 216572797 is about 600.5298994657.

The spelling of 216572797 in words is "two hundred sixteen million, five hundred seventy-two thousand, seven hundred ninety-seven".