216125231 has 6 divisors (see below), whose sum is σ = 251411040. Its totient is φ = 185250156.

The previous prime is 216125219. The next prime is 216125291. The reversal of 216125231 is 132521612.

It is not a de Polignac number, because 216125231 - 2¹⁴ = 216108847 is a prime.

It is a super-2 number, since 2×216125231² = 93420230949606722, 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 = 216125197 and 216125206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216125291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2205311 + ... + 2205408.

It is an arithmetic number, because the mean of its divisors is an integer number (41901840).

Almost surely, 2^216125231 is an apocalyptic number.

216125231 is a deficient number, since it is larger than the sum of its proper divisors (35285809).

216125231 is an equidigital number, since it uses as much as digits as its factorization.

216125231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410733 (or 4410726 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 216125231 is about 14701.1982844937. The cubic root of 216125231 is about 600.1159322277.

Adding to 216125231 its reverse (132521612), we get a palindrome (348646843).

The spelling of 216125231 in words is "two hundred sixteen million, one hundred twenty-five thousand, two hundred thirty-one".