216248431 has 4 divisors (see below), whose sum is σ = 247141072. Its totient is φ = 185355792.

The previous prime is 216248429. The next prime is 216248453. The reversal of 216248431 is 134842612.

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

It is a cyclic number.

It is not a de Polignac number, because 216248431 - 2¹ = 216248429 is a prime.

It is a super-2 number, since 2×216248431² = 93526767819923522, 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 = 216248393 and 216248402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216248491) 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, 15446310 + ... + 15446323.

It is an arithmetic number, because the mean of its divisors is an integer number (61785268).

Almost surely, 2^216248431 is an apocalyptic number.

216248431 is a deficient number, since it is larger than the sum of its proper divisors (30892641).

216248431 is an equidigital number, since it uses as much as digits as its factorization.

216248431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30892640.

The product of its digits is 9216, while the sum is 31.

The square root of 216248431 is about 14705.3878221555. The cubic root of 216248431 is about 600.2299405713.

The spelling of 216248431 in words is "two hundred sixteen million, two hundred forty-eight thousand, four hundred thirty-one".