216155247 has 48 divisors (see below), whose sum is σ = 364551936. Its totient is φ = 111513600.

The previous prime is 216155243. The next prime is 216155249. The reversal of 216155247 is 742551612.

216155247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216155247 - 2² = 216155243 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216155243) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 652872 + ... + 653202.

It is an arithmetic number, because the mean of its divisors is an integer number (7594832).

Almost surely, 2^216155247 is an apocalyptic number.

216155247 is a deficient number, since it is larger than the sum of its proper divisors (148396689).

216155247 is a wasteful number, since it uses less digits than its factorization.

216155247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 609 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 216155247 is about 14702.2191182148. The cubic root of 216155247 is about 600.1437127972.

It can be divided in two parts, 21615 and 5247, that added together give a palindrome (26862).

The spelling of 216155247 in words is "two hundred sixteen million, one hundred fifty-five thousand, two hundred forty-seven".