216460537 has 4 divisors (see below), whose sum is σ = 216490356. Its totient is φ = 216430720.

The previous prime is 216460529. The next prime is 216460561. The reversal of 216460537 is 735064612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 87160896 + 129299641 = 9336^2 + 11371^2 .

It is a cyclic number.

It is not a de Polignac number, because 216460537 - 2³ = 216460529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216460837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3837 + ... + 21157.

It is an arithmetic number, because the mean of its divisors is an integer number (54122589).

Almost surely, 2^216460537 is an apocalyptic number.

It is an amenable number.

216460537 is a deficient number, since it is larger than the sum of its proper divisors (29819).

216460537 is a wasteful number, since it uses less digits than its factorization.

216460537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29818.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 216460537 is about 14712.5979011186. The cubic root of 216460537 is about 600.4261204454.

The spelling of 216460537 in words is "two hundred sixteen million, four hundred sixty thousand, five hundred thirty-seven".