216047031 has 4 divisors (see below), whose sum is σ = 288062712. Its totient is φ = 144031352.

The previous prime is 216046997. The next prime is 216047053. The reversal of 216047031 is 130740612.

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-216047031 is a prime.

It is a super-2 number, since 2×216047031² = 93352639207829922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216046992 and 216047010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216047831) 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, 36007836 + ... + 36007841.

It is an arithmetic number, because the mean of its divisors is an integer number (72015678).

Almost surely, 2^216047031 is an apocalyptic number.

216047031 is a deficient number, since it is larger than the sum of its proper divisors (72015681).

216047031 is an equidigital number, since it uses as much as digits as its factorization.

216047031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72015680.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 216047031 is about 14698.5383967250. The cubic root of 216047031 is about 600.0435440620.

Adding to 216047031 its reverse (130740612), we get a palindrome (346787643).

The spelling of 216047031 in words is "two hundred sixteen million, forty-seven thousand, thirty-one".