243441953 has 2 divisors, whose sum is σ = 243441954. Its totient is φ = 243441952.

The previous prime is 243441949. The next prime is 243441971. The reversal of 243441953 is 359144342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243141649 + 300304 = 15593^2 + 548^2 .

It is a cyclic number.

It is not a de Polignac number, because 243441953 - 2² = 243441949 is a prime.

It is not a weakly prime, because it can be changed into another prime (243441973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121720976 + 121720977.

It is an arithmetic number, because the mean of its divisors is an integer number (121720977).

Almost surely, 2^243441953 is an apocalyptic number.

It is an amenable number.

243441953 is a deficient number, since it is larger than the sum of its proper divisors (1).

243441953 is an equidigital number, since it uses as much as digits as its factorization.

243441953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 243441953 is about 15602.6264776159. The cubic root of 243441953 is about 624.4032302601.

The spelling of 243441953 in words is "two hundred forty-three million, four hundred forty-one thousand, nine hundred fifty-three".