216431631499 has 2 divisors, whose sum is σ = 216431631500. Its totient is φ = 216431631498.

The previous prime is 216431631401. The next prime is 216431631527. The reversal of 216431631499 is 994136134612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216431631499 - 2¹¹ = 216431629451 is a prime.

It is a super-2 number, since 2×216431631499² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216431631799) 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, 108215815749 + 108215815750.

It is an arithmetic number, because the mean of its divisors is an integer number (108215815750).

Almost surely, 2^216431631499 is an apocalyptic number.

216431631499 is a deficient number, since it is larger than the sum of its proper divisors (1).

216431631499 is an equidigital number, since it uses as much as digits as its factorization.

216431631499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 49.

The spelling of 216431631499 in words is "two hundred sixteen billion, four hundred thirty-one million, six hundred thirty-one thousand, four hundred ninety-nine".