216526403 has 2 divisors, whose sum is σ = 216526404. Its totient is φ = 216526402.

The previous prime is 216526397. The next prime is 216526417. The reversal of 216526403 is 304625612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216526403 - 2⁶ = 216526339 is a prime.

It is a super-2 number, since 2×216526403² = 93767366392236818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216526463) 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, 108263201 + 108263202.

It is an arithmetic number, because the mean of its divisors is an integer number (108263202).

Almost surely, 2^216526403 is an apocalyptic number.

216526403 is a deficient number, since it is larger than the sum of its proper divisors (1).

216526403 is an equidigital number, since it uses as much as digits as its factorization.

216526403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 216526403 is about 14714.8361526726. The cubic root of 216526403 is about 600.4870147726.

The spelling of 216526403 in words is "two hundred sixteen million, five hundred twenty-six thousand, four hundred three".