216131506 has 32 divisors (see below), whose sum is σ = 359562240. Its totient is φ = 96915456.

The previous prime is 216131501. The next prime is 216131507. The reversal of 216131506 is 605131612.

It is not an unprimeable number, because it can be changed into a prime (216131501) 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, 374290 + ... + 374866.

It is an arithmetic number, because the mean of its divisors is an integer number (11236320).

Almost surely, 2^216131506 is an apocalyptic number.

216131506 is a deficient number, since it is larger than the sum of its proper divisors (143430734).

216131506 is a wasteful number, since it uses less digits than its factorization.

216131506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 216131506 is about 14701.4117009218. The cubic root of 216131506 is about 600.1217401121.

The spelling of 216131506 in words is "two hundred sixteen million, one hundred thirty-one thousand, five hundred six".