216620513 has 4 divisors (see below), whose sum is σ = 216760320. Its totient is φ = 216480708.

The previous prime is 216620491. The next prime is 216620527. The reversal of 216620513 is 315026612.

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 a cyclic number.

It is not a de Polignac number, because 216620513 - 2¹⁰ = 216619489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216620813) 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, 67553 + ... + 70686.

It is an arithmetic number, because the mean of its divisors is an integer number (54190080).

Almost surely, 2^216620513 is an apocalyptic number.

It is an amenable number.

216620513 is a deficient number, since it is larger than the sum of its proper divisors (139807).

216620513 is a wasteful number, since it uses less digits than its factorization.

216620513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139806.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 216620513 is about 14718.0335982766. The cubic root of 216620513 is about 600.5739997727.

The spelling of 216620513 in words is "two hundred sixteen million, six hundred twenty thousand, five hundred thirteen".