216731003 has 2 divisors, whose sum is σ = 216731004. Its totient is φ = 216731002.

The previous prime is 216730993. The next prime is 216731023. The reversal of 216731003 is 300137612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216731003 - 2²⁶ = 149622139 is a prime.

It is a super-2 number, since 2×216731003² = 93944655322772018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216731003.

It is not a weakly prime, because it can be changed into another prime (216731023) 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 as a sum of consecutive naturals, namely, 108365501 + 108365502.

It is an arithmetic number, because the mean of its divisors is an integer number (108365502).

Almost surely, 2^216731003 is an apocalyptic number.

216731003 is a deficient number, since it is larger than the sum of its proper divisors (1).

216731003 is an equidigital number, since it uses as much as digits as its factorization.

216731003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 216731003 is about 14721.7866782534. The cubic root of 216731003 is about 600.6760925083.

Adding to 216731003 its reverse (300137612), we get a palindrome (516868615).

The spelling of 216731003 in words is "two hundred sixteen million, seven hundred thirty-one thousand, three".