216023731 has 16 divisors (see below), whose sum is σ = 269936640. Its totient is φ = 167950080.

The previous prime is 216023719. The next prime is 216023747. The reversal of 216023731 is 137320612.

It is a cyclic number.

It is not a de Polignac number, because 216023731 - 2¹¹ = 216021683 is a prime.

It is a super-2 number, since 2×216023731² = 93332504710320722, 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 = 216023696 and 216023705.

It is not an unprimeable number, because it can be changed into a prime (216023791) 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, 33955 + ... + 39811.

It is an arithmetic number, because the mean of its divisors is an integer number (16871040).

Almost surely, 2^216023731 is an apocalyptic number.

216023731 is a deficient number, since it is larger than the sum of its proper divisors (53912909).

216023731 is a wasteful number, since it uses less digits than its factorization.

216023731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6354.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 216023731 is about 14697.7457795405. The cubic root of 216023731 is about 600.0219723435.

The spelling of 216023731 in words is "two hundred sixteen million, twenty-three thousand, seven hundred thirty-one".