243902641 has 2 divisors, whose sum is σ = 243902642. Its totient is φ = 243902640.

The previous prime is 243902629. The next prime is 243902657. The reversal of 243902641 is 146209342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148937616 + 94965025 = 12204^2 + 9745^2 .

It is a cyclic number.

It is not a de Polignac number, because 243902641 - 2¹¹ = 243900593 is a prime.

It is a Chen prime.

It is equal to p_13363636 and since 243902641 and 13363636 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (243942641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121951320 + 121951321.

It is an arithmetic number, because the mean of its divisors is an integer number (121951321).

Almost surely, 2^243902641 is an apocalyptic number.

It is an amenable number.

243902641 is a deficient number, since it is larger than the sum of its proper divisors (1).

243902641 is an equidigital number, since it uses as much as digits as its factorization.

243902641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 243902641 is about 15617.3826552339. The cubic root of 243902641 is about 624.7968542981.

The spelling of 243902641 in words is "two hundred forty-three million, nine hundred two thousand, six hundred forty-one".