216313651 has 4 divisors (see below), whose sum is σ = 227698600. Its totient is φ = 204928704.

The previous prime is 216313649. The next prime is 216313679. The reversal of 216313651 is 156313612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216313651 - 2¹ = 216313649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216313621) 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, 5692446 + ... + 5692483.

It is an arithmetic number, because the mean of its divisors is an integer number (56924650).

Almost surely, 2^216313651 is an apocalyptic number.

216313651 is a deficient number, since it is larger than the sum of its proper divisors (11384949).

216313651 is a wasteful number, since it uses less digits than its factorization.

216313651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11384948.

The product of its digits is 3240, while the sum is 28.

The square root of 216313651 is about 14707.6052095506. The cubic root of 216313651 is about 600.2902771353.

The spelling of 216313651 in words is "two hundred sixteen million, three hundred thirteen thousand, six hundred fifty-one".