218947453 has 2 divisors, whose sum is σ = 218947454. Its totient is φ = 218947452.

The previous prime is 218947447. The next prime is 218947481. The reversal of 218947453 is 354749812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169989444 + 48958009 = 13038^2 + 6997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218947453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218947493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109473726 + 109473727.

It is an arithmetic number, because the mean of its divisors is an integer number (109473727).

Almost surely, 2^218947453 is an apocalyptic number.

It is an amenable number.

218947453 is a deficient number, since it is larger than the sum of its proper divisors (1).

218947453 is an equidigital number, since it uses as much as digits as its factorization.

218947453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 218947453 is about 14796.8730818373. The cubic root of 218947453 is about 602.7168028842.

The spelling of 218947453 in words is "two hundred eighteen million, nine hundred forty-seven thousand, four hundred fifty-three".