216460477 has 2 divisors, whose sum is σ = 216460478. Its totient is φ = 216460476.

The previous prime is 216460423. The next prime is 216460487. The reversal of 216460477 is 774064612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127554436 + 88906041 = 11294^2 + 9429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216460477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216460417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108230238 + 108230239.

It is an arithmetic number, because the mean of its divisors is an integer number (108230239).

Almost surely, 2^216460477 is an apocalyptic number.

It is an amenable number.

216460477 is a deficient number, since it is larger than the sum of its proper divisors (1).

216460477 is an equidigital number, since it uses as much as digits as its factorization.

216460477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 216460477 is about 14712.5958620496. The cubic root of 216460477 is about 600.4260649687.

The spelling of 216460477 in words is "two hundred sixteen million, four hundred sixty thousand, four hundred seventy-seven".