216010931 has 4 divisors (see below), whose sum is σ = 216663864. Its totient is φ = 215358000.

The previous prime is 216010909. The next prime is 216010961. The reversal of 216010931 is 139010612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216010931 is a prime.

It is a super-2 number, since 2×216010931² = 93321444622973522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216010897 and 216010906.

It is not an unprimeable number, because it can be changed into a prime (216010901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325970 + ... + 326631.

It is an arithmetic number, because the mean of its divisors is an integer number (54165966).

Almost surely, 2^216010931 is an apocalyptic number.

216010931 is a deficient number, since it is larger than the sum of its proper divisors (652933).

216010931 is an equidigital number, since it uses as much as digits as its factorization.

216010931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652932.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 216010931 is about 14697.3103321662. The cubic root of 216010931 is about 600.0101211256.

The spelling of 216010931 in words is "two hundred sixteen million, ten thousand, nine hundred thirty-one".