216750631 has 2 divisors, whose sum is σ = 216750632. Its totient is φ = 216750630.

The previous prime is 216750619. The next prime is 216750647. The reversal of 216750631 is 136057612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216750631 - 2¹¹ = 216748583 is a prime.

It is a super-2 number, since 2×216750631² = 93961672077796322, which contains 22 as substring.

It is equal to p_11953453 and since 216750631 and 11953453 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 216750593 and 216750602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216750691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108375315 + 108375316.

It is an arithmetic number, because the mean of its divisors is an integer number (108375316).

Almost surely, 2^216750631 is an apocalyptic number.

216750631 is a deficient number, since it is larger than the sum of its proper divisors (1).

216750631 is an equidigital number, since it uses as much as digits as its factorization.

216750631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 216750631 is about 14722.4532942034. The cubic root of 216750631 is about 600.6942251463.

The spelling of 216750631 in words is "two hundred sixteen million, seven hundred fifty thousand, six hundred thirty-one".