216398453 has 2 divisors, whose sum is σ = 216398454. Its totient is φ = 216398452.

The previous prime is 216398449. The next prime is 216398461. The reversal of 216398453 is 354893612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210337009 + 6061444 = 14503^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 216398453 - 2² = 216398449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216398453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216398443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108199226 + 108199227.

It is an arithmetic number, because the mean of its divisors is an integer number (108199227).

Almost surely, 2^216398453 is an apocalyptic number.

It is an amenable number.

216398453 is a deficient number, since it is larger than the sum of its proper divisors (1).

216398453 is an equidigital number, since it uses as much as digits as its factorization.

216398453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

The square root of 216398453 is about 14710.4878573078. The cubic root of 216398453 is about 600.3687113365.

The spelling of 216398453 in words is "two hundred sixteen million, three hundred ninety-eight thousand, four hundred fifty-three".