216590477 has 2 divisors, whose sum is σ = 216590478. Its totient is φ = 216590476.

The previous prime is 216590417. The next prime is 216590501. The reversal of 216590477 is 774095612.

216590477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114297481 + 102292996 = 10691^2 + 10114^2 .

It is a cyclic number.

It is not a de Polignac number, because 216590477 - 2¹⁶ = 216524941 is a prime.

It is a super-2 number, since 2×216590477² = 93822869454175058, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216590417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108295238 + 108295239.

It is an arithmetic number, because the mean of its divisors is an integer number (108295239).

Almost surely, 2^216590477 is an apocalyptic number.

It is an amenable number.

216590477 is a deficient number, since it is larger than the sum of its proper divisors (1).

216590477 is an equidigital number, since it uses as much as digits as its factorization.

216590477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 216590477 is about 14717.0131820285. The cubic root of 216590477 is about 600.5462405142.

The spelling of 216590477 in words is "two hundred sixteen million, five hundred ninety thousand, four hundred seventy-seven".