216613397 has 16 divisors (see below), whose sum is σ = 290838912. Its totient is φ = 155805120.

The previous prime is 216613393. The next prime is 216613417. The reversal of 216613397 is 793316612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 216613397 - 2² = 216613393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216613397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216613393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107198 + ... + 109199.

It is an arithmetic number, because the mean of its divisors is an integer number (18177432).

Almost surely, 2^216613397 is an apocalyptic number.

It is an amenable number.

216613397 is a deficient number, since it is larger than the sum of its proper divisors (74225515).

216613397 is a wasteful number, since it uses less digits than its factorization.

216613397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216428.

The product of its digits is 40824, while the sum is 38.

The square root of 216613397 is about 14717.7918520408. The cubic root of 216613397 is about 600.5674234005.

The spelling of 216613397 in words is "two hundred sixteen million, six hundred thirteen thousand, three hundred ninety-seven".