216315639 has 12 divisors (see below), whose sum is σ = 315550872. Its totient is φ = 142782000.

The previous prime is 216315637. The next prime is 216315641. The reversal of 216315639 is 936513612.

216315639 is a `hidden beast` number, since 2 + 1 + 6 + 3 + 15 + 639 = 666.

It is an interprime number because it is at equal distance from previous prime (216315637) and next prime (216315641).

It is not a de Polignac number, because 216315639 - 2¹ = 216315637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216315637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118077 + ... + 119894.

It is an arithmetic number, because the mean of its divisors is an integer number (26295906).

Almost surely, 2^216315639 is an apocalyptic number.

216315639 is a deficient number, since it is larger than the sum of its proper divisors (99235233).

216315639 is a wasteful number, since it uses less digits than its factorization.

216315639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238078 (or 238075 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 216315639 is about 14707.6727934776. The cubic root of 216315639 is about 600.2921160906.

The spelling of 216315639 in words is "two hundred sixteen million, three hundred fifteen thousand, six hundred thirty-nine".